Ray Optics and Optical Instruments

Related Questions

• In an astronomical telescope, the focal length of objective lens and eye-piece are 150 cm and 6 cm respectively. In case when final image is formed at least distance of distinct vision. the magnifying power is

  ---

• A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using

  ---

• An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is

  ---

• The time required to pass the light through a glass slab of $2 mm$ thick is (${{\mu }_{glass}}=1.5$)

  ---

• Two plane mirrors are at $45^\circ $ to each other. If an object is placed between them, then the number of images will be

  ---