Ray Optics and Optical Instruments

Related Questions

• A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are joined together. The power of the combination will be

  ---

• The focal length of a convex lens depends upon

  ---

• The refractive index of water and glass with respect to air is 1.3 and 1.5 respectively. Then the refractive index of glass with respect to water is

  ---

• If the focal length of a double convex lens for red light is ${{f}_{R}},$ its focal length for the violet light is

  ---

• A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is

  ---