A spherical mirror of focal length 20 cm forms an erect image half of that of object. Find the nature of mirror and also find image distance and object distance.
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Answer:
Radius of curvature, R = 20 cm
Radius of curvature of a spherical mirror = 2 × Focal length (f)
R = 2f
Hence, the focal length of the given spherical mirror is 10 cm.