First slide

The lens

Question

If the focal length of a double convex lens for red light is f_R , its focal length for the violet light is

Moderate

A

f_R
B

Greater than f_R
C

Less than f_R
D

2f_R

Solution

$f \propto \frac{1}{μ - 1} and μ \propto \frac{1}{λ}$

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