Question

Q4 To form an image twice the size of an object using a convex lens of focal
length 20 cm, the distance of an object must be *
< 20 cm
> 20 cm
between 20 cm and 40 cm
cannot say

Answer 1

Answer:

Explanation:

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

Answer 2

Answer:

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