a concave lens has focal length of 15 CM the image due to the object placed is formed at 10 cm from the lens. the magnification produced by lens is
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u= -10
v=?
m=?
by mirror formula
1/f=1/v+1/u
1/-15= 1/v+1/-10
1/v=1/-15 -1/-10
=1/-15+1/10
=10-15/-150
=-5/-150
=1/3o
v=30
m= - v / u
= -30/-10
=3