Question

A concave lens of focal length 15 cm form an image 10 cm form the lens. How far is the object placed from the lens? Draw the ray diagram.
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Answer 1

Answer:

use the formula 1/f=1/u+1/v that's it

Answer 2

❥ 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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