Question

The real image of an object formed by a convex lens is magnified twice when it is placed at a distance of 20 cm from the lens. At what distance should it be placed to get an erect image magnified 4 times?​

Answer 1

Answer:

When the image formed by a convex lens, inverted and same size as the object, then the distance of the object from the lens is 2f (twice the focal length). Here,

Focal length, f=20 cm

So, 2f=2×20 cm

=40 cm

Thus, the object should be placed at a distance of 40 cm in front of the convex lens. (Please draw the ray diagram yourself).

Answer 2

Answer:

yes the right answer answer is 40

Explanation:

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