A concavo-convex lens is made of glass of refractive index

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

1.5

. The radii of curvature of its two surfaces are

30\text{ cm}

and

50\text{ cm}

. Its focal length when placed in a liquid of refractive index

1.4

is (1)

200\text{ cm}

(2)

500\text{ cm}

(3)

800\text{ cm}

(4)

1050\text{ cm}