Question

the focal length of a concave mirror is 15cm.If the object distance is 60cm find the image distance​

Answer 1

f = -15

u = -60cm

v = ?

→ 1/v + 1/u = 1/f

→ 1/v = 1/f - 1/u

→ 1/v = 1/(-15) - 1/(-60)

→ 1/v = -1/15 + 1/60

→ 1/v = -4 + 1/60

→ 1/v = -3/60

→ v = -60/3

→ v = -20cm

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