First slide

Ray optics

Question

A lens of glass is immersed in water. What will be its effect on the power of the lens ? Power will:

Moderate

A

increase
B

decrease
C

remain same
D

become zero

Solution

$P_{air} = (μ - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}}) in air$
$P_{water} = (\frac{μ}{μ_{water}} - 1) (\frac{1}{R_{1}} - \frac{1}{R_{2}}) in water$
$P_{water} < P_{air}$

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