Question

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11. A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far
is the object placed from the lens draw the ray diagram

Answer 1

Focal length (f ) = -15 cm

Distance of image (v) = -10 cm

1v–1u=1f

1/u = -(1/10) – (1/- 15)

1/u =1/15 – 1/10

1/u = -0.033

u = -30 cm

so the object is placed 30 cm away from the concave lens.

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Answer 2

Answer:

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