Question

A concave mirror has focal length of 20 cm at what distance from the mirror a 5cm tall object be placed so that it forms an image at 40 cm from the mirror? Also calculate the size of the image formed.
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Answer 1

Answer:

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Step-by-step explanation:

The distance should be 40 cm from the mirror to form an image at 40 cm and in this case the size of the image will also be.

equal to the original object , means 5 cm .

The above phenomenon is there because whenever the object is kept on the centre of curvature of a concave mirror , the distance of the image will be the same as the object and the size of the image will also be the same.

I found out the above information as-

we know-

focal length = centre of curvature / 2

so to find the centre of curvature, I applied the formula .

20 = C / 2

C = 40

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