CBSE  /  Class 12  /  Physics  /  Ray Optics and Optical Instruments

  • 1. 
    Which of-the following is not a property of light?

  • It can travel through vacuum
  • It has a finite speed
  • It requires a material medium for its propagation
  • It involve transportation energy

  • 2. 
    Two points P and q are situated at the same distance from a source of light but on opposite sides. The plane difference between the light waves passing through P and q will be:

  • n
  • 2n
  • \(\frac{π}{2}\)
  • zero

  • 3. 
    The phase difference between the electric and the magnetic field vectors in electromagnetic waves is

  • \(\frac{π}{4}\)
  • \(\frac{π}{2}\)
  • π
  • zero

  • 4. 
    A ray of light travelling in air is incident of a glass slab. The ray gets partly reflected and partly refracted. The phase difference between the reflected and the refracted waves is :

  • \(\frac{π}{2}\)
  • \(\frac{π}{4}\)
  • π
  • zero

  • 5. 
    Which of the following cannot be polarised?

  • radiowaves
  • transverse waves
  • sound waves
  • X-rays

  • 6. 
    Light year is the unit of:

  • distance
  • time
  • intensity of light
  • None of these

  • 7. 
    If a mirror is approaching you at a speed of 10 ms^1, the speed with which your image approach you is:

  • 10 ms-1
  • 5 ms-1
  • 20 ms-1
  • 15 ms-1

  • 8. 
    The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r. to w ater is:

  • 8/9
  • 9/8
  • 7/6
  • 2

  • 9. 
    The angle of minimum deviation for an equilateral glass prism is 30°. Refractive index of the prism is:

  • \(\frac{1}{√3}\)
  • √2
  • 1
  • can't be determined

  • 10. 
    A beam of light is incident at 60° to a plane surface. The reflected and refracted rays are perpendicular to each other. What is the R.I. of the surface:

  • \(\frac{1}{√3}\)
  • √3
  • \(\frac{1}{3}\)
  • 3
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