Ray Optics and Optical Instruments

Related Questions

• In an astronomical telescope, the focal lengths of two lenses are 180 cm and 6 cm respectively. In normal adjustment, the magnifying power will be

  ---

• A light ray is incident upon a prism in minimum deviation position and suffers a deviation of 34°. If the shaded half of the prism is knocked off, the ray will

  ---

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

  ---

• An achromatic combination of lenses is formed by joining

  ---

• A lens is placed between a source of light and a wall. It forms images of area ${{A}_{1}}$ and ${{A}_{2}}$ on the wall for its two different positions. The area of the source or light is

  ---