Question

a canvave mirror produce 5 times inlarged real image of object placed 20 cm .Calculate focal length
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Answer 1

Explanation:

A concave mirror creates an enlarged image as real. So, the image is created in front of the mirror.

Now, magnification, m= v/u = 5

Given, u=8cm

So, v/8 = 5

or, v=8×5=40cm

The image is located 40cm in front of the mirror.