Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 202427 JanuaryMorning Shift
Exam
JEE Main
Year
2024
Date
27 January
Shift
Morning Shift
Subject
Physics
Chapter
Ray Optics

JEE Main 2024 · 27 January · Morning Shift · Physics · Ray Optics

A convex lens of focal length 40cm forms an image of an extended...

A convex lens of focal length 40cm40cm forms an image of an extended source of light on a photoelectric cell. A current II is produced. The lens is replaced by another convex lens having the same diameter but focal length 20cm20cm. The photoelectric current now is

Options

  1. AI2\dfrac{I}{2}
  2. B4I4I
  3. C2I2I
  4. DII

Correct answer

D. II

Step-by-step solution

For a light of any given frequency, the photoelectric current is directly proportional to the intensity of light.

As the diameter of the lens remains the same, both lenses will collect the same amount of light. Therefore, the intensity of the light will remain the same.

Hence, this is the correct option.

Practice Ray Optics on Quantrex Academy →

More from Ray Optics

A double convex lens made of glass of refractive index 1.5 and radii of curvature of the… JEE Advanced 2026A beam of polychromatic light passes through a thin prism of prism angle 6^∘ . The… JEE Advanced 2026Consider two isosceles prisms 1 and 2 with prism angles A_1 and A_2 and refractive… JEE Advanced 2026A thin biconvex lens is prepared from the glass ( μ=1.5 ) both curved surfaces of which… JEE Main 2026Light ray incident along a vector AO ( AO = 2 i -3 j ) emerges out along vector OB ( OB =… JEE Main 2026Angle of minimum deviation is equal to the half of the angle of prism in an equilateral… JEE Main 2026A concave mirror of focal length 10 cm forms an image which is double the size of object… JEE Main 2026A spherical interface lens of radius R separates two media of refractive indices 1 and… JEE Main 2026 Full Ray Optics list All JEE Main PYQs