Question

We use very thin lens, so that a light ray passing through its optical centre goes un-deviated.

• A. So that we do not waste too much glass
• B. So that the ray passing through optical centre goes un-deviated

Answer 1

The correct option is B

So that the ray passing through optical centre goes un-deviated

The more the thickness of a glass slab, more is the deviation of the light ray passing through it. The centre of the lens is similar to a glass slab. Hence, we make the lenses thin so that the light ray goes undeviated if it falls on the pole.