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An object is placed at a distance of 12cm in front of a concave mirror.It forms a real image 4 times larger than the object. Calculate the distance of the image from the mirror.
Asked by 02shubhamkj | 13 Dec, 2018, 20:19: PM
answered-by-expert Expert Answer
magnification formula for concave mirror : m =  -v/u  .................(1)
where m is magnification, v is image to mirror distance and u is object to mirror distance.
 
real image and 4 times larger means , image is inverted, hence from eqn (1) by substituting m = -4 and u =12
we get v.
 
-4 = -v/12  or v = 48 cm
 
Answered by Thiyagarajan K | 13 Dec, 2018, 22:42: PM

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