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Q.

Rays from the sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that the size of its image is equal to the size of the object?


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a

15cm in front of the mirror

b

30cm in front of the mirror

c

Between 15 cm and 30 cm in front of the mirror

d

More than 30 cm in front of the mirror 

answer is B.

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Detailed Solution

The object should be placed 30 cm in front of the mirror.
Given that rays from the sun converge at a point 15cm in front of a concave mirror. Since we know that the radius of curvature is double the focal length,
R = 2×f  Here, R is Radius of curvature and f is focal length.
R = 2 × 15 
R = 30 cm.
 
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