A hollow lens is made of thin glass as shown.It can be filled with air, water (n = 1.3)or CS₂ (carbon disulfide, n = 1.6).A beam of parallel light entering the lens will diverge if the lens is filled with:

Question

Quizplus · Accepted Answer

The lens will diverge light if it has a higher refractive index than the surroundings, and the light enters at an angle greater than the critical angle (the angle at which light is no longer refracted but reflected). In this case, CS₂ has a higher refractive index than water and air, and if the lens is filled with CS₂ and placed in water, the light will enter the lens at an angle greater than the critical angle, causing it to diverge. Therefore, option D is the correct answer.

A Hollow Lens Is Made of Thin Glass as Shown