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Chaitanya Borah Grade: 11
        

a convex mirror is placed 20cm behind athin convex lens of 15cm focal length when a small object is placed at a distance og 20cm in front of the lens, the image formed at the same place calculata the focal length of the convex lens?

7 years ago

Answers : (1)

Chetan Mandayam Nayakar
312 Points
										

for lens, (1/20)+(1/v) = 1/15, therefore v=60cm


for mirror, (1/U)+(1/V)=1/f


U= -25cm and V= 35cm


therefore, f= -87.5cm

6 years ago
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