A lens is formed by a material having refractive index 3/2 and radii of curvature 20 cm and 10 cm. Then choose the correct option(s):

Select all that apply

• Option A

  If lens is concavo-convex and light is falling on the surface having radius of curvature 20 cm, then focal length is 40 cm

• Option B

  If lens is concavo-convex and light is falling on the surface having radius of curvature 10 cm, then focal length is - 40 cm

• Option C

  If lens is convexo-concave and light is falling on the surface having radius of curvature 20 cm, then focal length is 40 cm

• Option D

  If lens is convexo-concave and light is falling on the surface having radius of curvature 10 cm, then focal length is - 40 cm