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Question

When an object of height 1 cm is kept at a distance of 4 cm from a concave mirror, its upright image of height 1.5 cm is formed at a distance of 6 cm behind the mirror. Calculate the focal length of the mirror(only magnitude) ___


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Solution

u = - 4 cm

v = 6 cm

Mirror formula 1f = 1v + 1u

1f = 14 + 16

f = -12 cm

Focal length of the mirror is 12 cm.


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