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 :
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:
A plano-convex lens is made of refractive index of 1.6. The focal length of the lens is
A convex lens of focal length f_(1) is kept in contact with a concave lens of focal length f_(2) . Find the focal length of the combination.
An equiconvex lens of refractive index mu_(2) is placed such that the refractive :
A plano-convex lens mu = 1.5 has focal length of 18 cm in air. Calculate the radius of curvature of the spherical surface.
Curved surfaces of a plano-convex lens of refractive index mu_(1) and a plano-concave lens of refractive index mu_(2) have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.
A plano-convex lens has refractive index 1.6 and radius of curvature 60 cm. What is the focal length of the lens?
The figure below shows a thin plano-convex lens of refractive index mu_(1) and a thin plano-concave lens of refractive index mu_(2) , both having same radius of curvature R of their curved surfaces. Another thin lens of refractive index mu_(3) has same radius of curvature R on the two surface between the plano-convex and plano-concae lenses that the plane surfaces are parallel to each other. Find the focal length of the combination.
Consider an equiconvex lens of radius of curvature R and focal length f. If fgtR , the refractive index mu of the material of the lens
