Given figures shows the arrangement of two lenses. The radii of curvature of all the curved surfaces are same. The ratio of the equivalent focal length of combinations P,Q and R is:

Given figures show the arrangements of two lenses. The radii of curvature of all the curved surfaces are same. The ratio of the equivalent focal length of combinations P, Q and R is ......

Find the focal length of the lens shown in Fig . The radii of curvature of both the surfaces are equal to R.

Find the focal length of the lens shown in Fig . The radii of curvature of both the surfaces are equal to R.

Four combinations of two thin lenses are given in List- I. The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5. Match lens combinations in List-I with their focal length in List-II and select the correct answer using the code given below the lists.

Four combinations of two thin lenses are given in List I . The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5 Match lens combinations in List I with their focal length in List II and select the correct answer using the code given below the lists. (A) (p) 2 r (B) (q) ( r)/(2) ( C) (r) - r (D) (s) r . Code :

Four combinations of two thin lenses are given in List I . The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5 Match lens combinations in List I with their focal length in List II and select the correct answer using the code given below the lists. (A) (p) 2 r (B) (q) ( r)/(2) ( C) (r) - r (D) (s) r . Code :

Four combinations of two thin lenses are given in List I . The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5 Match lens combinations in List I with their focal length in List II and select the correct answer using the code given below the lists. (A) (p) 2 r (B) (q) ( r)/(2) ( C) (r) - r (D) (s) r . Code :

Find the focal length of the lens shown in the figure. The radii of curvature of both the surfaces are equal to R

If R_(1) and R_(2) are the radii of curvature of double convex lens made of same material, the lens with more focal length is