CBSE Class 10 Answered
A concave lens produces an image 20 cm from the lens for an object placed 30 cm from the lens. Find the focal length of the lens.
Asked by Srishti Mallick | 04 Dec, 2013, 10:04: PM
Expert Answer
For concave lens:
u = -30 cm, v = -20 cm (as it always forms a virtual image)
From the lens formula, we have
Answered by Romal Bhansali | 05 Dec, 2013, 09:37: AM
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