Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object? (a) 15 cm in front of the mirror (b) 30 cm 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:(d) more than 30 cm in front of the mirror

When the object distance equals the radius of curvature, i.e. twice the focal length, the image size equals the object size in the case of a concave mirror.

Here

f= 15

The radius of curvature is double the focal length

Hence C = 30

As a result, the object must be placed 30 cm in front of the concave mirror.

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