Ray Optics · JEE Main previous year questions

2023 27 questions

1. Q382023 · 24 Jan 2023 · Shift 2

   When a beam of white light is allowed to pass through convex lens parallel to principal axis, the different colours of light converge at different points on the principal axis after refraction. This is called :

   1. A.Spherical aberration
   2. B.Scattering
   3. C.Polarisation
   4. D.Chromatic aberration
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   Answer: D

2. Q512023 · 24 Jan 2023 · Shift 2· Numerical answer

   A convex lens of refractive index 1.5 and focal length 18cm in air is immersed in water. The change in focal length of the lens will be ________ cm. (Given refractive index of water $=\frac{4}{3}$)

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   Answer: 54