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17.2 thin planoconcave lens of radii of curvature of curved surface 20cm and 24cm respectively.Curved surfaces are kept together and space between them is filled with liquid of refractive index 4/3.Refractive index of lens is 3/2.Find out focal length of the system. |
| Answer» 17.2 thin planoconcave lens of radii of curvature of curved surface 20cm and 24cm respectively.Curved surfaces are kept together and space between them is filled with liquid of refractive index 4/3.Refractive index of lens is 3/2.Find out focal length of the system. | |