1.

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.

Answer»


Solution :When the object is placed at infinite distance, the image is formedat the PRINCIPAL focus. RADIUS of CURVATURE, (R) =20 cm.
Focal length `-(R)/(2)=(20)/(2)=-10cm`.


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