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Question

Physics Question on spherical lenses

What is lens maker's formula?

A

1f=(n−1)(1R1+1R2)\frac 1f=(n-1)(\frac {1}{R_1}+\frac {1}{R_2})

B

1f=(n−1)(1R1−1R2)\frac 1f=(n-1)(\frac {1}{R_1}-\frac {1}{R_2})

C

1f=(n+1)(1R1+1R2)\frac 1f=(n+1)(\frac {1}{R_1}+\frac {1}{R_2})

D

1f=(n+1)(1R1−1R2)\frac 1f=(n+1)(\frac {1}{R_1}-\frac {1}{R_2})

Answer

1f=(n−1)(1R1−1R2)\frac 1f=(n-1)(\frac {1}{R_1}-\frac {1}{R_2})

Explanation

Solution

The correct option is (B): 1f=(n−1)(1R1−1R2)\frac 1f=(n-1)(\frac {1}{R_1}-\frac {1}{R_2}).