Question

What is the value of magnification produced by a convex lens when an object is
kept at a distance from the pole which is twice the focal length of the lens? .​

Answer 1

Explanation:

Correct option is

A

31

Here,

Object distance, u=−2f

Image distance, v=?

From mirror formula, 

v1+u1=f1

v1+−2f1=f1

v1=2f3

v=32f

Now,

Magnification, M=u−v

=−(−2f)32f

=31

(M is positive for convex mirror)

Answer 2

Answer:

1/3

Explanation:

Object distance, u=−2f

Image distance, v=?

From mirror formula,

Remaining answer in attachment

Hope it helps

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