Question

A spherical air bubble in water will act as a _____.A) Convex lens B)Concave lens C)Plane glass plate D) Plano concave lens

Answer 1

Answer:

concave lens

Explanation:

A spherical air bubble has air inside it so, its u is less than water. So by lens maker formula

f/1 = ( u2/u1 - 1) ( 1/R1 - 1/R2)

Here u2 is R.I. of material of lens i.e air and u1 is R.I of surrounding medium.

So, u2 < u1 ,

(∵ u of air < u of water )

So, ( u1 /u2-1 ) is negative

and ( 1/R1 - 1/ R2 - 1 ) is positive

So, 1/f is negative

=> f is negative

Hence air bubble will act as a concave lens, because concave lens have negative focal lengths.

Answer 2

Answer:

Hello Brainly user.....!!♡

B)Concave lens