Question

Why is a thin lens preferred over a thicker one?

• A. To remove wastage of glass.
• B. To avoid lateral displacement of the light ray.
• C. To increase the power of the lens.
• D. To avoid reflection of light.

Answer 1

The correct option is B To avoid lateral displacement of the light ray.

The center of the lens is similar to a glass slab. After passing a ray through a glass slab, it undergoes lateral shift. This shift increases with the thickness of the glass slab. The lens is made thin so that the light ray suffers least deviated when it falls on the optical center of the lens.