Question

Which of the following is equal to ×3

Answer 1

Answer:

Radius of curvature = 20cm

so, focal length = 10cm

We are given, ho/2 = hi

so, ho= 2hi

so, m = hi/ho

m = ho/2ho

m = 1/2

so, m = -v/u

1/2 = -v/u

so, u = -2v

By mirror formula,

1/f = 1/v+1/u

1/10 = 1/v -(-1/2v)

1/10 = 1/v+1/2v

so, 1/10 = 2+1/2v

so, 1/10 = 3/2v

so, 2v = 30

so, v = 15 cm

so, position of object, u = -2(v) = -30

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