Question

The focal length of convex lens is 10 cm where should an object be placed so as to get real image
magnified twice.
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm

Answer 1

Answer:

c)15cm

Explanation:

because if we keep between 2f1 and f1 we will get magnified image

Answer 2

Answer:15

Explanation:By using the relation

Of Vand U in equlant m and f