Question

The distance between a real object and it's real image is 56cm formed by converging lens ,focal length of lens

Answer 1

The focal length of the lens is 17.28 cm.

Explanation:

Given that,

Image distance = 56 cm

Suppose the object distance is 25 cm.

We need to calculate the focal length

Using lens formula

$\dfrac{1}{f}=\dfrac{1}{v}-\dfrac{1}{u}$

Where, f = focal length

u = object distance

v = image distance

Put the value into the formula

$\dfrac{1}{f}=\dfrac{1}{56}+\dfrac{1}{25}$

$\dfrac{1}{f}=\dfrac{81}{1400}$

$f=17.28\ cm$

Hence, The focal length of the lens is 17.28 cm.

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Topic : converging lens

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