an image 2/3 of size of the object is formed by a convex lens at a distance of 12 cm from it . find the focal length of lens
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Use the formula 1/f=1/u+1/v
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h' = 2/3 * h
h'/h = 2/3
m = 2/3
v = 12cm
m = -v/u = 2/3
-12/u = 2/3
u = -18cm
1/f = 1/u + 1/v
= 1/36
so , focal length (f) = 36 cm
h'/h = 2/3
m = 2/3
v = 12cm
m = -v/u = 2/3
-12/u = 2/3
u = -18cm
1/f = 1/u + 1/v
= 1/36
so , focal length (f) = 36 cm
vanshica:
magnification is not negative in case of lens
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