Question

You are provided with two convex lenses of the same aperture and different thickness. Which

one of them will be of shorter focal length? pls. elaborate the answer​

Answer 1

Explanation:

For clarity, we shall consider same value , R for radius of curvature for both surfaces of a lens.

For less thick lens we take R=R1

For more thick lens R=R2.

It is clear that R2<R1.

Now,

(1/f1)=(n-1)[(1/R1)-(-1/R1)=(n-1)(2/R1) or

f1=R1/[2(n-1)]……………………(1) (less thick lens).

f2=R2/[2(n-1)]…………………..(2). (more thick lens.)

Since R1>R2, we have,f1>f2.

Hence, more thick lens is of shorter focal length.

Answer 2

Answer:

the convex lens having more thickness will have shorter focal length.

Explanation:

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