A concave mirror of focal length 10cm forms image of an object 4 times larger.Find the distance of object from the pole?

Answers (1)

f = -10 cm
m = 4 = -v/u
v = -4u
u = ?
1/f = 1/v + 1/u
-1/10 = -1/4u + 1/u 

u=-7.5 cm

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