Question

An object is kept in front of a concave mirror of focal length 15 cm. The image formed is three
times the size of object. Calculate two possible distances of the object from the mirror.​

Answer 1

Answer:

given image is 3 times that of object. so there is 2 case: image is real , inverted and magnified OR the image is virtual , erect and magnified. so m= 3 or -3 . hence v = 3u or v = -3u . f = -15 cm (given). Using mirror formula:

1/u+1/3u = -1/15 gives u = -20 cm.

OR

1/u - 1/3u = -1/15 gives u = -10 cm.

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