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Q.

An object is placed at 36 cm from the pole of a concave mirror with a focal length of 18 cm. Where is the image of the given object formed?


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a

Centre of curvature

b

Pole

c

Principal focus

d

None of the above 

answer is A.

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Detailed Solution

The image of the given object is formed at the centre of curvature.
The focal length of the given concave mirror is 18 cm, and the object is placed 36 cm from the pole of the mirror, which means that the object is placed at the centre of curvature. Therefore, the image is formed at the centre of curvature and is real and inverted in nature. Also, the image formed is of the same size as the object. Hence, the image is formed 36 cm in front of the mirror.
 
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