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

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since the image is real the magnification is -3.

now v/u=-3

u= v/-3

now substitute the value of u in lens formula

1/20=1/v -(-3/v)

1/20=4/v

v=80cm

therefore u=-80/3 =-26.67(approx)

Hope it helps!

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