· The dispersive powers of the materials of the two
lenses are in the ratio 4: 3. If the achromatic
combination of these two lenses in contact is a
convex lens of focal length 60 cm then the focal
lengths of the component lenses are
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Explanation:
see , double answers are possible because , someone can assume ratio of concave lens to convex lens as 4:3 or someone will assume ratio of concave lens to convex lens as 3:4 , in exam only one option will be there among them. thanks
now , see the magic , the answer which has come is in the ration of 3:4 or 4:3
thats what i was saying you in previous questions.
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