A diverging meniscus lens of radii of curvature 25cm and 50cm has a Refractive index 1.5. Its focal length is (in cm )

A plano convex lens of radius of curvature 30 cm and refractive index 1.5 is kept in air. Find its focal length (in cm).

A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly

The radii of curvatures of a convex lens are 0.04 m and 0.04m. Its refractive index is 1.5. Its focal length is

A biconvex lens has radii of curvature 20 cm and 40cm. The refractive index of the material of the lens is 1.5. An object is placed 40cm in front of the lens. Calculate the psition of the image.

The radii of curvatures of a double convex lens are 15 cm and 30 cm, and its refractive index is 1.5. Then its focal length is -

The focal length of a concave-convex lens of radii of curvature 5 cm and 10 cm is 20 cm. what will be its focal length in water ? Given .^(a)mu_(w) = 4//3 .

A double convex lens has faces of radii of curvature 30 cm each. The refractive index of the material of the lens is 1.5. What is the focal length of this lens when immersed is carbondisulphide of refractive index 1.6 ?

A double convex lens has radii of curvature equal to 10 cm and 15 cm of the two faces. Given the focal length of lens is 12 cm, calculate the refractive index of glass.

The radii of curvature of a lens are +20cm and +30cm .The material of the lens has a refractive index 1.6 .Then focal length of the lens (in cm) if it is placed in water of refractive index mu =(4)/(3) is

A biconvex lens with equal radii curvature has refractive index 1.6 and focal length 10 cm. Its radius of curvature will be: