Question

an object is placed in front of the concave mirror of focal length 15 CM the image formed is 3 times the size of the object calculate two possible distance of the object from the mirror......

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Answer 1

Imagthe object distance may be 15 or greater than 15.

Answer 2

okay the given mirror is a concave mirror.

having f = -15cm

m = -v/u = +3 (if the object is virtual)

so, v=-3u

using mirror formula:

1/f = 1/v+1/u

(-1/15) = 1/u + (-1/3u)

u= -10cm

m = -v/u = -3 (if the image is real and inverted)

for real image

v=3u

using mirror formula:

1/f = 1/v +1/u

(-1/15) = 1/u + 1/(3u)

u=-20cm

The two possible positions are 10 cm and 20 cm in front of concave mirror

hope it helps

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