A convex lens of a focal length 20cm produces a real image 3 times mag

1.	A convex lens of a focal length 20cm produces a real image 3 times magnified.Find the object distance
Answer» Explanation: f = 20 cm m = -3 = v/u v = -3u LENS formula: 1/v - 1/u = 1/f 1/(-3u) - 1/u = 1/20 - 4/(3u) = 1/20 3u = - 4 x 20 u = -80/3 = - 26.6 cm The object is at a distance of 26.6 cm to the LEFT from the OPTIC CENTRE of the lens

A convex lens of a focal length 20cm produces a real image 3 times magnified.Find the object distance

Answer»

Explanation:

f = 20 cm m = -3 = v/u v = -3u LENS formula: 1/v - 1/u = 1/f 1/(-3u) - 1/u = 1/20 - 4/(3u) = 1/20 3u = - 4 x 20 u = -80/3 = - 26.6 cm The object is at a distance of 26.6 cm to the LEFT from the OPTIC CENTRE of the lens

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A convex lens of a focal length 20cm produces a real image 3 times magnified.Find the object distance

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