Question

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♡︎ 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. 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​

Answer 1

Answer:

Answer

A

Solution

As light rays from sun (u=∞) converge at a point 15 cm in front of a concave mirror, hence focal length of concave mirror f = - 15 cm.

To form an image of exactly same size as that of an object, the object should be placed at the centre of curvature (u = R = 2f) of mirror. Hence, the object should be placed at 30 cm in front of mirror.

Step-by-step explanation:

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Answer 2

Answer:

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It is given that sun rays converge at 15 cm. So, focal length of the mirror = f = 15 cm. In case of a concave mirror, the size of image and object will be same if the object is placed at 2f. Hence, in this case object must be place at 2f or 2 × 15 = 30 cm.

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