When two lenses of focal length +10 cm and -5 cm are placed in contact, then find the net
power.
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10
it should be -5 cm it would just because you would just need to 10 cm - 5 cm right?
meh names bob
Answered by
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In the case of convex lens, When the object is af 2F, then the image also forms at 2F with the following characteristics.
Characteristics of image: Real, inverted, same size as that of object
As image distance is given as 40 cm, it should be equal to 2F.
So, focal length, F = 40 / 2 = 20 cm
Power of the lens: P = 100 / F = 100 / 20 = 5D
Nature of the lens: Convex
Characteristics of image: Real, inverted, same size as that of object
As image distance is given as 40 cm, it should be equal to 2F.
So, focal length, F = 40 / 2 = 20 cm
Power of the lens: P = 100 / F = 100 / 20 = 5D
Nature of the lens: Convex
abhay1951:
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