When an object is placed at a distance of 15cm from a concave mirror its image is formed at 10cm in front of the mirror calculate the focal length of the mirror?

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When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror. Calculate the focal length of the mirror.

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v = -10cm (as object is on left side)

u = -15cm (as image formed is also on left side)

Therefore, 1/f = -1/10 + (-1/15)

1/f = -1/6

f = -6 cm