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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 16 - Optics > 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 μ1 and that of 2 is μ2, then the focal length of the combination is :

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 μ1 and that of 2 is μ2, then the focal length of the combination is :

In figure the number of reflections it makes before emerging form the other end is close to : (refractive index of fiber is 1.31 and sin40^∘=0.64) the optical fiber is l = 2 m long and has a diameter of d=20μm. If a ray of light is incident on one end of the fiber at angle θ1=40^∘