Question

An object is placed at a distance of 10 cm from a lens of power 4D find the position of the image formed

Answer 1

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Answer 2

Explanation:

P = 1/f

4 = 1/f

f = 1/4m, 1/4×100 = 25cm

Since focal length is positive, it is a convex lens

u = -10cm f = 25cm

1/f = 1/v-1/u

1/25 = 1/v- 1/(-10)

1/25-1/10 = 1/v

2-5/50 = 1/v

v = - 50/3 or 16.66cm

m = v/u

m = -50/3/-10/1

m = 5/3 or 1.66

Image is enlarged, virtual and erect

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