Question

Where should an object be placed from a converging lens of focal length 20cm,
so as to obtain a real magnified imag​

Answer 1

Answer:

We know that m = v/u

magnified image = 2m

2 = v/u

v = 2u [1]

By using the mirror formula

1/f = 1/u + 1/v

1/f = 1/v - 1/u

1/20 = 1/2u - 1/u

1/20 = 1 - 2/2u

1/20 = -1/2u

u = -10 cm

v = 2(-10) = -20 cm

Answer 2

Answer:

A convex lens of focal length 20 cm forms a real and magnified image when the object is placed between 20 cm and 40 cm

Explanation:

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