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A concave mirror is formed from a sphere...

A concave mirror is formed from a sphere of radius 20 cm. The image of an object at an infinite distance is formed at a distance of _____ cm from the mirror.

Text Solution

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The correct Answer is:
10cm
When the object is placed at infinite distance, the image is formed at the principal focus. Radius of curvature, (R) = 20cm
Focal length =` R/2 = 20/2 = 10cm`
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