The radius of curvature of a concave mirror is 50cm. Where should be an object be placed from the mirror so at to form its image at infinity?
Justify your answer.

Given: The radius of curvature of a concave mirror is 50cm

To find: Where should be an object be placed from the mirror so as to form its image at infinity

Solution:

Here R=50 cm

We know, focal length (f) = $\frac{R}{2}$

focal length (f) = $\frac{50}{2}$ =25 cm

If an object is placed at the focus of a concave mirror, then the image is formed at infinity.

So, the object should be placed 25 cm in front of the mirror.

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Updated on: 10-Oct-2022

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