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JEE Light Waves PYQs with Solutions

86 previous year questions from Light Waves (JEE Main & Advanced Physics) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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About Light Waves PYQs

Light Waves has 86 previous year questions in the Quantrex Academy JEE Main & Advanced Physics bank. The 86 questions in this list come from Concepts Of Physics MCQ Edition [Volume 1] (86). Each question opens on its own page with the options, the correct answer and the worked solution where available.

Light Waves questions with solutions

1

Determine the frequency range of light that is visible to an average human being ( 400 nm < λ < 700 nm ).

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 2

In air, sodium light has a wavelength of 589 nm . Determine its frequency in water (refractive index = 1.33 ).

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In air, sodium light has a wavelength of 589 nm . Determine its speed in water (refractive index = 1.33 ).

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In air, sodium light has a wavelength of 589 nm . Determine its frequency in air.

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For light of wavelength 400 nm , the index of refraction of fused quartz is 1.472 , and for light of wavelength 760 nm , it is 1.452 . Determine the speeds of light for these

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 6

In air, sodium light has a wavelength of 589 nm . Determine its wavelength in water (refractive index = 1.33 ).

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 7

In a certain liquid, the speed of yellow light is 2.4 × 10^8 m s^ -1 . Determine the refractive index of the liquid.

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 8

Light of wavelength 5.0 × 10^ -7 m is emitted in phase from two narrow slits. An interference pattern is formed on a screen placed 1.0 m away. Determine the separation between the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 9

Separated by a distance of 1.0 cm , two narrow slits emit light in phase. The light has a wavelength of 5.0 × 10^ -7 m . An interference pattern is formed on a screen positioned

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 10

In a Young's double slit experiment, the separation between consecutive dark fringes is 1.0 mm . The screen is situated at a distance of 2.5 m from the slits, while the separation

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 11

In an experiment on double slit interference, the distance separating the slits is 1.0 mm and the wavelength of the light is 5.0 × 10^ -7 m . The screen is placed 1.0 m away from

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 12

During a double slit interference experiment, light with a wavelength of 5.0 × 10^ -7 m is used, and the separation between the slits is 1.0 mm . The screen is positioned 1.0 m

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 13

In a Young's double slit experiment, two narrow vertical slits positioned 0.800 mm apart are illuminated by the same source of yellow light having a wavelength of 589 nm .

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 14

In a double slit interference experiment, a source emits light of wavelengths 480 nm and 600 nm . The separation between the slits is 0.25 mm , and the interference is observed on

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 15

In a Young's double slit experiment employing white light, determine the minimum order of the violet fringe ( λ = 400 nm ) that overlaps with a red fringe ( λ = 700 nm ).

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Determine the thickness of a plate required to produce a change in the optical path equal to half the wavelength λ of light travelling through it normally. The plate has a

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In a double slit experiment, a plate having thickness t and refractive index μ is positioned in front of one of the slits. Determine the change in the optical path resulting from

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 18

In a double slit experiment utilizing light of wavelength λ , a plate of refractive index μ and thickness t is placed in front of one of the slits. Assuming no light absorption in

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 19

In a Young's double slit experiment using monochromatic light of wavelength 620 nm , a transparent paper (refractive index = 1.45 ) with a thickness of 0.02 mm is pasted over one

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During a Young's double slit experiment with monochromatic light, introducing a mica sheet of refractive index 1.6 and thickness 1.964 micron ( 1 micron = 10^ -6 m ) into the path

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 21

Determine the angular separation between consecutive bright fringes for a Young's double slit experiment using blue-green light of wavelength 500 nm . The distance between the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 22

A double slit apparatus is fitted with a mica strip and a polystyrene strip on its two slits. The thickness of the strips is 0.50 mm , while the separation between the slits is

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A double slit apparatus is fitted with a mica strip and a polystyrene strip on its two slits. The thickness of the strips is 0.50 mm , while the separation between the slits is

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 24

Two transparent slabs of equal thickness but distinct refractive indices μ_1 and μ_2 are joined side by side to create a composite slab. This slab is positioned immediately after

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 25

A thin paper of thickness 0.02 mm with a refractive index of 1.45 is pasted across one of the slits in a Young's double slit experiment. The paper transmits 4/9 of the incident

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A thin paper of thickness 0.02 mm with a refractive index of 1.45 is pasted across one of the slits in a Young's double slit experiment. The paper transmits 4/9 of the incident

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 27

A Young's double slit apparatus features slits separated by 0.28 mm and a screen located 48 cm from the slits. The entire setup is submerged in water, and the slits are

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In a Young's double slit experiment, a parallel beam of monochromatic light is used. The slits are separated by a distance d and the screen is placed parallel to the plane of the

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A narrow slit S transmitting light of wavelength λ is positioned a distance d above a large plane mirror. Light arriving directly from the slit and light arriving after reflection

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A narrow slit S transmitting light of wavelength λ is positioned a distance d above a large plane mirror. Light arriving directly from the slit and light arriving after reflection

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A long narrow horizontal slit is positioned 1 mm above a horizontal plane mirror. The interference between the light arriving directly from the slit and the light arriving after

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 32

A long narrow horizontal slit is placed 1 mm above a horizontal plane mirror. The interference pattern formed by the light arriving directly from the slit and the light arriving

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Coherent light of wavelength λ illuminates a double slit S_1 - S_2 . The separation between the slits is d . A plane mirror is positioned in front of the double slit at a distance

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White coherent light ( 400 nm – 700 nm ) is passed through the slits of a Young's double slit experiment. The separation between the slits is 0.5 mm and the screen is situated 50

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 35

White coherent light ( 400 nm – 700 nm ) is passed through the slits of a Young's double slit experiment. The separation between the slits is 0.5 mm and the screen is situated 50

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 36

An optical arrangement is depicted in the figure. The distance D is significantly greater than the separation d between the slits. Determine the minimum value of d such that a

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For an optical arrangement as depicted in the figure, the distance D is significantly greater than the slit separation d . Assume d is set to the minimum value required to produce

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For an optical arrangement as depicted in the figure, the distance D is significantly greater than the slit separation d . Assume d is set to the minimum value required to produce

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 39

Two coherent point sources S_1 and S_2 , vibrating in phase, emit light of wavelength λ . The distance separating the sources is 2λ . Considering a line that passes through S_2

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 40

The figure displays three equidistant slits illuminated by a monochromatic parallel beam of light. Given that BP_0 - AP_0 = λ/3 and D λ , determine the distance d between adjacent

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 41

Consider three equidistant slits A, B, and C (with B located between A and C) illuminated by a monochromatic parallel beam of light. A screen is positioned at a distance D ( D λ )

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 42

In a Young's double slit experiment, the distance of the screen from the slits is 2.0 m , the separation between the slits is 2.0 mm , and the wavelength of the light used is 600

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 43

In a Young's double slit interference experiment, the fringe pattern is observed on a screen placed at a distance D from the slits. The slits are separated by a distance d and are

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 44

In a Young's double slit interference experiment, the fringe pattern is observed on a screen placed at a distance D from the slits. The slits are separated by a distance d and are

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 45

In a Young's double slit experiment, λ = 500 nm , d = 1.0 mm , and D = 1.0 m . Determine the minimum distance from the central maximum at which the intensity is half of the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 46

In a Young's double slit experiment, the line-width of a bright fringe is occasionally defined as the distance between the points on either side of the central line at which the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 47

Consider the setup shown in the figure. Two slits S_1 and S_2 are placed symmetrically around the central line and are illuminated by a monochromatic light of wavelength λ . The

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Two slits S_1 and S_2 , located symmetrically about the central axis, are illuminated by monochromatic light of wavelength λ . The distance between these slits is d . The light

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Two slits S_1 and S_2 , arranged symmetrically around the central line, are illuminated by monochromatic light having wavelength λ . The slit separation is d . Light transmitted

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Observe the setup illustrated in the figure. Through a certain mechanism, the separation between the slits S_3 and S_4 can be adjusted. The intensity is recorded at the point P

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Observe the setup illustrated in the figure. Through a certain mechanism, the separation between the slits S_3 and S_4 can be adjusted. The intensity is recorded at the point P

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 52

Observe the setup illustrated in the figure. Through a certain mechanism, the separation between the slits S_3 and S_4 can be adjusted. The intensity is recorded at the point P

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 53

When observed using reflected light of wavelength 580 nm , a soap film with a thickness of 0.0011 mm appears dark. Determine the index of refraction of the soap solution, given

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 54

A parallel beam of light having a wavelength of 560 nm is incident on a thin film of oil with a refractive index of 1.4 . Determine the minimum thickness of the film required for

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A parallel beam of white light is incident normally on a water film of thickness 1.0 × 10^ -4 cm . Determine the wavelengths in the visible range ( 400 nm – 700 nm ) that are

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A glass surface is covered by a uniform oil film with a thickness of 1.00 × 10^ -4 cm . The refractive index of the oil is 1.25 , while that of the glass is 1.50 . Determine the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 57

Plane microwaves are incident on a long slit of width 5.0 cm . Determine the wavelength of the microwaves if the first diffraction minimum is observed at θ = 30^ ^ ^ ∘ .

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 58

Light of wavelength 560 nm passes through a pinhole of diameter 0.20 mm and strikes a wall located at a distance of 2.00 m . Determine the diameter of the central bright spot

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A parallel beam of light of wavelength 620 nm is focused by a convex lens of diameter 8.0 cm . Determine the diameter of the central bright spot formed if the light is focused at

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The speed of light is dependent

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Which of the following phenomena provides evidence that light is a transverse wave?

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As light undergoes refraction into a medium,

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 63

Light is best described as a

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A light wave is described by the equation y = A (kx - ω t) . In this expression, y denotes the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 65

Which of the following characteristics remains unchanged when light undergoes refraction?

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 66

An amplitude modulated (AM) radio wave bends noticeably around the corners of a 1 m × 1 m board, whereas a frequency modulated (FM) wave bends only negligibly. Given that the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 67

Which of the sources listed below produces the best monochromatic light?

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The wavefronts of a light wave travelling in vacuum are defined by x + y + z = c . The angle formed by the direction of propagation of the light with the X-axis is

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 69

The wavefronts of light arriving from a distant source of unknown shape are approximately

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The inverse square law of intensity (where intensity ∝ (1)/(r^2) ) holds true for a

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 71

Two sources are considered coherent if the waves they produce

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Two coherent sources with different intensities emit waves that interfere with each other. If the ratio of the maximum intensity to the minimum intensity is 25 , the ratio of the

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When a thin transparent sheet is placed in front of a Young's double slit, the fringe-width will

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 74

When Young's double slit experiment is conducted in water,

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When a drop of oil spreads across a water surface, it exhibits beautiful colours in daylight due to

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 76

In a Young's double slit experiment, the slits possess equal width, and the source is positioned symmetrically relative to them. The intensity at the central fringe is I_0 . If

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 77

A light wave can propagate

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 78

Huygens' principle of secondary wavelets can be applied to

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 79

The speed of light emitted by a source is measured as v_A , v_B , and v_C by three observers A , B , and C , respectively. Observer A travels towards the source and observer C

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 80

Which of the following characteristics of light conclusively support the wave theory of light?

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As light propagates through a vacuum, an electric field and a magnetic field are present. These fields

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 82

Light waves propagate in a vacuum along the X-axis. Which of the following equations may represent the wavefronts?

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If the light source utilized in a Young's double slit experiment is changed from red to violet,

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A Young's double slit experiment is conducted using white light.

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Consider four light waves given by the expressions: (i) y = a_1 ω t (ii) y = a_2 (ω t + ε) (iii) y = a_1 2ω t (iv) y = a_2 2(ω t + ε) Interference fringes can be produced by the

Concepts Of Physics MCQ Edition [Volume 1] Solution View → 86

Three observers A , B and C measure the speed of light coming from a source to be v_A , v_B and v_C . The observer A moves towards the source and C moves away from the source at

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