Questions
Radius of concave mirror is 40 cm and the size of image (real) is twice as that of object, then the object distance is
a
60 cm
b
20 cm
c
40 cm
d
30 cm
detailed solution
Correct option is D
f=R2=402cm=20cm, ϑ=-2u 1f=1V+1u 1-20=1-2u+1−u∴u=30cmTalk to our academic expert!
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