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Question

How will the magnitude of magnification change if an object placed at center of curvature is moved towards focus in concave mirror?


A

It decreases

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B

It increases

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C

It remains constant

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D

It becomes equal to infinity

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Solution

The correct option is B

It increases


(1)

(2)

(3)

As the object moves towards focus, the height of the image increases as shown in these ray diagrams.

We know that magnification (m) = height of imageheight of object.

As the height of the image increases, the numerator increases, which in turn leads to the increase in the magnitude of magnification.


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