An object at a distance of 30cm from a concave mirror gets its image at a same poimt. The focal length of the mirror is

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An object at a distance of 30cm from a concave mirror gets its image at a same poimt. The focal length of the mirror is

Shivakumaraswamy J.M Shivakumar 8th Dec, 2020

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Answer (1)

Pakshal Ghiya 8th Dec, 2020

Hello,

It's a simple one.

If the object distance (u) is 30 cm and image distance (v) is also 30cm.

So by the formula of a mirror is,

1/f=1/u+1/v u

Puttingall the values,

1/f=1/30+1/30

so,

1/f=1/15

Then,

f=15cm.

Hope you got your answer.

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