JEE Main 2026 Physics question
A compound microscope is designed with two symmetric biconvex lenses. The objective lens is cut vertically, creating two identical plano-convex lenses. One of them is used in place of original objective lens. To retain same magnification keeping the object distance unchanged, the tube length has to be
Answer: (A)
Solution
Cutting the symmetric biconvex lens through its centre (perpendicular to the axis) gives a plano-convex lens with focal length twice the original (1/=(μ−1)/R vs
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