A concave lens has a focal length of 50 cm- What is the power of the lens-A- -0-2 DB- -0-02 DC- -0-02 DD- -0-01 D

The correct option is The power of a lens is given as : P = 1/f Here, by sign convention, f = 50cm So, P = 0.02 D ...

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Physics

Myopia and Its Correction

A concave len...

Question

A concave lens has a focal length of 50 cm. What is the power of the lens?

+0.2 D

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+0.02 D

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-0.02D

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-0.01D

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Solution

The power of a lens is given as :

$P = \frac{1}{f}$

Here, by sign convention, $f = - 50 c m$

So, P = -0.02 D

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A concave lens has a focal length of 50 cm. What is the power of the lens?

The power of a lens is given as : P = 1f Here, by sign convention, f = −50cm So, P = -0.02 D

The power of a lens is given as :

$P = \frac{1}{f}$

Here, by sign convention, $f = - 50 c m$

So, P = -0.02 D