CBSE Class 10 Answered
12 cm is the radius of curvature of concave mirror. The image obtained by it is real and has magnification of the 3/2. Find object distance
Asked by navdurgacrane1997 | 16 Jul, 2018, 08:50: PM
Expert Answer
focal length f of concave mirror = 1/2 of radius of curvature = 12/2 = 6 cm .
magnification of mirror, m = -v/u = -1.5 ..............(1)
where v is image distance and u is object distance
(it is given that image is real. In concave mirror real images are inverted, hence -ve sign i.e. -1.5 is used in eqn.(1) )
from eqn.(1) , v = 1.5 u ................(2)
we have mirror eqn.,
Substituting value of f and using eqn.(2), eqn.(3) becomes :
solving for u in the eqn.(4), we get u = 10 cm
Answered by Thiyagarajan K | 17 Jul, 2018, 04:46: PM
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