First slide

The lens

Question

A double convex lens of glass of $μ$ = 1.5 has radius of curvature of each of its surface is 0.2 m. The power of the lens is

Moderate

A

$+ 10 dioptres$
B

$- 10 dioptres$
C

$- 5 diontres$
D

$+5 dioptres$

Solution

$f = \frac{R}{2 (μ - 1)} \Rightarrow P = \frac{2 (μ - 1)}{R} = \frac{2 (1 .5 - 1)}{0 .2} = + 5 D$

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