An object is placed 40cm from a concave mirror. If image formed is 24cm infront of the mirror, then the focal length of mirror is?
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Image distance = v = -24 cm
Object distance = u = -40 cm
As we Know that By Mirror Formula,
1/v + 1/u = 1/f
-1/24 - 1/40 = 1/f
-5-3/120 = 1/f
-8/120 = 1/f
f = -120/8 cm
f = -15 cm
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