Question

We are given a concave lens of focal length 15 cm. Draw a ray diagram to show
the nature, size and position of the image formed when the object is kept at a
distance of
(a) 30 cm (b) 15 cm (c) 10 cm
from the lens.

Answer 1

Answer:

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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