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One plano-convex and one plano-concave lens of same radius of curvature 'R' but of
different materials are joined side by side as shown in the figure. If the refractive index of the material
of 1 is and that of 2 is
, then the focal length of the combination is:
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Lensmaker's Formula -
- wherein
Lens placed close to each other -
- wherein
For lens 1
For lens 2
Option 1)
Option 2)
Option 3)
Option 4)