A converging lens that for which f = 55mm forms an image 4 times larger than...

Question

Question

A converging lens that for which f = 55mm forms an image 4 times larger than the object. How far is the object if the image is virtual?

science physics

Answer 1

Answer #1

The general formula for a converging (convex) lens is

------------------------------ (1)

Where

is the object distance

is the image distance and

is the focal length.

Given

Here the image is virtual. This is because the object distance is smaller than the focal length.

It is given that the linear magnification .

That is

Substituting all these in equation (1), we will get

That is

Or

Answer 2

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