Important Questions of Ray Optics and Optical Instruments Physics | Zigya

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391.

An object is located 4 m from the first of two thin converging lenses of focal lengths 2 m and 1 m, respectively. The lenses are separated by 3 m. The final image formed by the second lens is located from the source at a distance of 

            

  • 8.0 m

  • 5.5 m

  • 6.0 m

  • 6.5 m


392.

A ray of light is incident at an angle i on a glass slab of refractive index µ. The angle between reflected and refracted light is 90°. Then, the relationship between i and µ is

  • i = tan-1 1μ

  • tan i = µ

  • sin i = µ

  • cos i = µ


393.

When light is refracted from a surface, which of its following physical parameters does not change ?

  • Velocity

  • Amplitude

  • Frequency

  • Wavelength


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