Ray Optics and Optical Instruments

Related Questions

• A ray of light is incident normally on one of the face of a prism of angle $30^o$ and refractive index $\sqrt{2}$. The angle of deviation will be

  ---

• Wavelength of light used in an optical instrument are ${{\lambda }_{1}}=4000$Å and ${{\lambda }_{2}}=5000$Å, then ratio of their respective resolving power (corresponding to ${{\lambda }_{1}}$and ${{\lambda }_{2}})$is

  ---

• Two thin lenses of focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ are in contact and coaxial. The combination is equivalent to a single lens of power

  ---

• A converging lens is used to form an image on a screen. When upper half of the lens is covered by an opaque screen

  ---

• In Gallilean telescope, if the powers of an objective and eye lens are respectively +1.25 D and – 20 D, then for relaxed vision, the length and magnification will be

  ---