Question

object distance (u)=60cm , focal length (f)=20cm find the image distance

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Answer 1

Answer:

Ok , i will explain in mirror as well as Lens

Explanation:

Mirror:

Given , u=60cm

f=20cm

Using Mirror Formula = 1/u + 1/v = 1/f

1/60 + 1/v = 1/20cm

1/v = 1/f - 1/u

1/v = 1/20 - 1/60cm

1/v = 3-1/60cm

1/v = 1/30cm

v=30cm

Lens:

Given: u = 60cm , f = 20cm

Using Lens Formula = 1/v-1/u = 1/f

1/v = 1f + 1/u

1/v = 1/20 + 1/60

1/v = 3+1/60

1/v ≈ 0.07[Approx]