Question

Q.8 Rays from sun converge at a point 10 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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Answer 1

Answer:

The ray diagram illustrates that, in case of a concave mirror, the image size becomes equal to the object size when the object distance equals the radius of curvature, i.e, twice the focal length.

So, the object has to be placed at a distance of (15×2)=30 cm in front of the concave mirror.

Explanation:

The ray diagram illustrates that, in case of a concave mirror, the image size becomes equal to the object size when the object distance equals the radius of curvature, i.e, twice the focal length.

So, the object has to be placed at a distance of (15×2)=30 cm in front of the concave mirror.