Question

Four lens are made of glass and the radius of curvature of each face is given below. Which will
have the greatest focal power​

Answer 1

Answer:

Solution :

1f=(μ−1)(1R1−1R2)

P∝(1R1−1R2)

(1) 110−1−15=530=16=0.16

(2) 15−1−10=310=0.30

(3) 115−1∞=115=.06

(4) 120−1−30=560=112=0.08

Explanation: