Question

If the power of the lens is +4D.then the focal length of lens and nature of the lena?

Answer 1

Hlew,

Here's your answer...

power of a lens is determined by the formula

p=1/f(when focal length is in metres) &

p=100/f(when focal length is in centimetres)

hair, the power is given as four diopters point on equity we get,

4=100/f

f=100/4

=25cms

Thanks,

Sorry baby 'wink'

Answer 2

The focal length of the convex lens is 25 cm.

Explanation:

Given that,

Power of lens = 4 D

The power of the lens is reciprocal of the focal length of the lens.

We need to calculate the focal length of the lens

Using formula of power

$P=\dfrac{100}{f}$

$f=\dfrac{100}{f}$

Put the value into the formula

$f=\dfrac{100}{4}$

$f=25\ cm$

This lens is convex.

Hence, The focal length of the convex lens is 25 cm.

Learn more :

Topic : nature of lens

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