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[" 18) A plano convex lens of refractive...

[" 18) A plano convex lens of refractive index "mu_(1)" and "],[" focal length "f_(1)" is kept in contact with another "],[" plano concave lens of refractive index "mu_(2)" and "],[" focal length "f_(2)." If the radius of curvature of their "],[" spherical faces is R each and "f_(1)=2f_(2)," then "mu_(1)],[" spherical faces is R each and "f_(1)=2f_(2)," then "mu_(1)],[" and "mu_(2)" are related as "],[square mu_(1)+mu_(2)=1],[qquad [2 mu_(1)+mu_(2)=1],[3 mu_(2)+mu_(1)=1],[2 mu_(2)+mu_(1)=1]]

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A plano convex lens of refractive index mu_(1) and focal length f_(1) is kept in contact with another plano concave lens of refractive index mu_(2) and focal length f_(2) . If the radius of curvature of their spherical faces is R each and f_(1)=2f_(2) , then mu_(1) and mu_(2) are related as :

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A Plane convex lens of refractive index mu_1 and focal length f_1 is kept in contact with another plane concave lens of refractive index mu_2 and focal length f_2 If the radius of curvature of their spherical faces is R each and f_1 = 3 f_2 then mu_1 " and " mu_2 are related as:

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A plano-convex lens has focal length of 20 cm. the radius of its spherical suface is (""_(a) mu_(g)=1.5)