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a concave mirror has a radius of curvature of 20 cm the image of a object formed in mirrror is 2.50 times the size of object . how for is the mirror from the object 
Asked by bandilradharani | 11 Apr, 2019, 11:37: AM
answered-by-expert Expert Answer
radius of curvature = 20 cm,  focal length f = 10 cm
 
magnification = v/u = 2.5,  or  v = 2.5u ...............(1)
 
where v is image-to-mirror distance and u is object to mirror distance
 
we have mirror equation:  (1/v) + (1/u) = 1/f  
 
[ 1/(2.5u) ] + (1/u) = 1/10
 
(1/u) [ (2/5) + 1 ] = (1/10)   or  (1/u) = (5/7)(1/10)  = (1/14)
 
hence object is placed at 14 cm from mirror
Answered by Thiyagarajan K | 11 Apr, 2019, 14:05: PM

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