The greatest thickness of a Plano-convex lens ,when viewed normally through its plane surface, appears to be `8//300` m and when viewed normally through its curved surface,appears to be `16//500 m`.If the actual thickness is 0.04 m,find its refractive index,

The greatest thickness of a plano-convex lens ,when viewed normally through its plane surface,appears to be 8//300 m and when viewed normally through its curved surface,appers to be 16//500 m .If the actual thickness is 0.04 m,find its radius of cruature

A transparent cube of side 210 mm contains a small air bubble. Its apparent distance, when viewed through one face of the cube is 100 mm and when viewed through the opposite face is 40 mm. What is the actual distance of the bubble from the second face and what is the refractive index of the material of the cube?

The slant side of a right circular cone is 10 m and its height 8 m. find the area of its curved surface.

The height of a cone is 16 m and the radius of its base is 12 m. What is the area of its curved surface ?

If the radius of a sphere is measured as 9 m with an error of 0.03 m, then find the approximate error in calculating its surface area.

Find the radius of curvature of the convex surface of a plano convex lens,whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5/

Curved surface area of a right circular cylinder is 4.4 m^2 . If the radius of the base of the cylinder is 0.7 m, find its height.