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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?

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?

Grade:11

1 Answers

Chetan Mandayam Nayakar
312 Points
10 years ago

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

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