Question

In the concave mirror object is placed at a distance of 50cm from the mirror than the magnification is -1/2.now where should be the object distance when magnification is -1/2

Answer 1

Initially,

U = - 50cm
V = unknown
M = - 1/2

-V/U = - 1/2
-V/-50 = - 1/2
-2V = - 100
V = 50CM

Now,
V=50cm
U is unknown
M = - 1/2

Therefore,
-V/U = - 1/2
-50/U = - 1/2

Therefore U equals - 50cm

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