Q.40 Rays from Sum 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) 30 cm in front of the mirror
b) 15 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
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The rays of sun are coming from infinity that is why u= Infinity is taken here. After that it is a law that image and object distance are equal at U=2F. A is the correct option
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Answer:
object is placed at 2f.
Explanation:
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. ∴ In this case, the object must be placed at 2f.
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