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?
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The decimal representation of the rational number is __________
1) Always terminating
2) Either terminating or repeating
3) Either terminating or non-repeating
4) Neither terminating nor repeating
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In the problem, it is given that the sun rays converge at 15 cm. So, the focal length of the mirror $ = $f $ = $ 15 cm. In the case of a concave mirror, the size of the image and object will be the same if the object is placed at 2f. $\therefore $ In this case, the object must be placed at 2f.
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