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Cutting of Thin Lenses

Focal power o...

Question

Focal power of a plano-concave lens of refractive index 1.5 and of radius of curvature 50cm is

A

2 D

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B

- 1 D

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C

1.5 D

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D

- 1.5 D

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Solution

The correct option is A $- 1 D$
$\frac{1}{f} = p = (1.5 - 1) (\frac{- 1}{.50})$
$p = \frac{- 1}{2 \times 0.5} = - 1 D$

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