Question

An optical device ‘X’ is placed obliquely in the path of a narrow parallel beam of light. If the emergent beam gets displaced laterally, the device ‘X’ is:

• A. Plane mirror
• B. Convex lens
• C. Glass slab
• D. Glass prism

Hint:

A glass slab causes lateral displacement of light without altering the direction of the light, while other devices may bend or focus the light differently.

Answer 1

The Correct Option is C

A glass slab causes lateral displacement of light without changing its direction. When light passes through a glass slab, it refracts at both surfaces, and the emergent ray is displaced laterally compared to the incident ray. This is characteristic of a glass slab, not a plane mirror, lens, or prism, which would cause the light to be reflected, focused, or dispersed, respectively. Therefore, the correct answer is option (3).