Question

an object is placed at the distance of 20 cm from a concave mirror the image is double the size of the brick and is inverted find the focal length of the mirror and the position where the images formed​

Answer 1

The focal length is 13 cm  and image is placed at 40 cm from the mirror.

Explanation:

Image is inverted and double the size means magnification v/u is -2

So v = -2u

Given data:

u = 20 Then v = 40

By sign convention , both u and v are taken negative

By mirror formula

l/f = l/u + l/v

1/f = 1/20 + 1/40

1/f = 0.075

We get f = -13.3 cm ~ 13 cm

So focal length 13 cm

Image is placed at 40 cm from the mirror on the same side of the object.

Also learn about focal length

What is the focal length ?

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Answer 2

Answer:

answer given by first person is wrong its answer is 16 cm and 48 cm

Explanation:

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