Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

Identify the incorrect statements with reference to dispersion of white light.

(A) Red light gets most deviated while passing through the prism.
(B) Thick lenses show chromatic aberrations due to dispersion.
(C) Refractive index of medium for different colours is different.
(D) Red light travels faster than violet light in the prism.
(E) While light, once dispersed, cannot be recombined.

Choose the correct answer from the options given below:

Options:

(B), (C) and (D) only

(B) and (D) only

(A) and (E) only

(A) and (B) only

Correct Answer:

(B), (C) and (D) only

Explanation:

The correct answer is Option (1) → (B), (C) and (D) only

(B) Chromatic aberrations occur in thick lenses due to the dispersion of the light, where different colours focus at different times.

(C) The refractive index of the material depends upon the wavelength of the light and hence it varies for different colours.

(D) Red light travel faster than violet light due to low refractive index.