an image of 2 by 3 of the size of the object is formed by a convex lens at a distance of 12 cm from it find the focal length of the lens
alkavsanghavi66:
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Therefore v=12cm
For real and inverted image the magnification will be negative.therefore m= -2/3
m = v/u
-2/3 = 12/u
u = (12x3)/-2 = -18cm
1/v - 1/u = 1/f
(2+3)/ 36 = 1/f
f - 36/5 = 7.2cm
For real and inverted image the magnification will be negative.therefore m= -2/3
m = v/u
-2/3 = 12/u
u = (12x3)/-2 = -18cm
1/v - 1/u = 1/f
(2+3)/ 36 = 1/f
f - 36/5 = 7.2cm
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