A point object is placed on the axis of the concave mirror at a distance of 60 cm from the focal point of the mirror. Its image is formed at the point of object, then focal length of the mirror is

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A point object is placed on the axis of the concave mirror at a distance of 60 cm from the focal point of the mirror. Its image is formed at the point of object, then focal length of the mirror is

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60 cm

15 cm

30 cm

120 cm

answer is C.

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Detailed Solution

Since the image is formed at the point of object i.e., object is kept on the radius of curvature (R).

$Given, u = f + 60 = v = R$

$∴ R = 2 f$

$So, f + 60 = 2 f$

$f = 60$

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