Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas JEE Main2020PhysicsWave OpticsPractice

Fraunhofer diffraction pattern of a single slit is obtained in the focal plane of the lens of focal length 1 m . The third minimum is formed at a distance of 5 mm from the central maximum and the wavelength of light used in the experiment is 5000 Å . From the given data find the width (in mm ) of the slit used in the experiment.

Correct answer

0.3

Step-by-step solution

Using a sin ⁡ θ = n λ Or a . x f = 3 λ or a = 3 λ . f x = 3 × 5000 × 10 - 10 × 1 5 × 10 - 3 = 3 × 10 - 4 m

Practice Wave Optics on Quantrex Academy →

More from Wave Optics

In the List-I, four optical effects are mentioned. The physical phenomena of light which are essential to describe these optical effects are given in List-II. Choose the option whi 2026In a single slit diffraction experiment, a slit of width (0.016 0.002) mm is used to measure the wavelength of a monochromatic light source. In the diffraction pattern, the angular 2026As shown in the figure, a ray AB of unpolarized light enters from water of refractive index n_w = 4/3 into a medium of refractive index n_p = 4/ 3 after passing through a glass pla 2026Some distant star is to be observed by some telescope of diameter of objective lens a , at an angular resolution of 3.0 10⁻⁷ radian. If the wavelength of light from the star reachi 2026In a Young double slit experiment, the wavelength of incident light is 6000 Å, the separation between slits S₁ and S₂ is 5 cm and the distance between slits plane and screen is 50 2026In interference experiment the path difference between two interfering waves at a point A on the screen is /3 , where is the wavelength of these waves, and at another point B the p 2026An unpolarized light of intensity I_o passes through polarizer and then through a certain optically active solution and finally it goes to analyser. If the angle between analyser a 2026The maximum intensity in a Young's double slit experiment is I₀ . Distance between the slits ( d ) is 5 , where is the wavelength of light used. The intensity of the fringe, exactl 2026 Full Wave Optics list All NTA Abhyas JEE Main PYQs