• 1. 
    Fiber optic cables work because of the principle of _____.

  • total internal refraction
  • incomplete internal refraction
  • total internal reflection
  • partial internal reflection
  • 2. 
    How is light affected by an increase in the index of refraction?

  • Its frequency increases
  • Its frequency decreases
  • Its speed increases
  • Its speed decreases
  • 3. 
    Choose the correct statement that describes what happens to the ray of light if the critical angle is 48o and the angle of incidence is 48o

  • refract
  • totally internally reflect
  • travel along the boundary
  • 4. 
    The following is an example of?

  • Fluorescence
  • Bioluminescence
  • Chemiluminescence
  • Electric Discharge
  • 5. 
    In the formula m = hi/ho, the variable "m" refers to ___.

  • the height of the image
  • the height of the object
  • the focal point
  • how reduced or enlarged the image is compared to the object
  • 6. 
    What type of image does this lens form?

  • Virtual image
  • Real Image
  • No Image
  • 7. 
    The following type of light source is

  • Incandescence
  • Fluorescence
  • Electric Discharge
  • Phosphorescence
  • 8. 
    Thin film of kerosene on water surface appear coloured due to

  • scattering
  • dispersion
  • interference
  • refraction
  • 9. 
    What happens to light during total internal reflection?

  • The angle of incidence is greater than the critical angle.
  • The angle of reflection is the same as the critical angle.
  • The angle of refraction is less than the critical angle.
  • The angle of incidence is zero.
  • 10. 
    According to the Law of reflection, a light ray striking a mirror

  • continues moving through the mirror in the same direction
  • moves into the mirror at a slightly different angle
  • bounces off the mirror toward the direction it came from
  • bounces off the mirror at the same angle it hits.
  • 11. 
    The point in the middle way between a curved mirror and the center of curvature is the

  • principle point
  • focal point
  • center of curvature
  • principle axis
  • 12. 
    The line that passes through the center of a curved mirror is called

  • focal point
  • center of curvature
  • principle axis
  • light ray
  • 13. 
    Property of light wave does not change on change in medium

  • speed
  • wavelength
  • frequency
  • amplitude
  • 14. 
    Coherent sources have

  • same frequency
  • constant or zero phase difference
  • both a and b
  • none of these
  • 15. 
    When light passes at an angle to the normal from one medium into another in which its speed is higher

  • it is bent toward the normal.
  • it always lies along the normal.
  • it is unaffected.
  • it is bent away from the normal.
  • 16. 
    All rays that are parallel to the principle axis in a concave mirror reflects

  • Towards the focal point
  • Away from the focal point
  • Towards the center of curvature
  • Away from the center of curvature
  • 17. 
    Bending of light from sharp edges is called

  • reflection
  • refraction
  • dispersion
  • polarisation
Report Question