Wave Theory Of Light 12th (MCQ With Answers)

Wave Theory Of Light 12th (MCQ With Answers)

The Wave Theory Of Light 12th (MCQ With Answers) are:

01. The light waves consisting of vibration of electric field vectors in all possible planes are called ______

02. A wavefront originating from a point source of light at finite distance is called ________ wavefront

03. In double refraction, out of the two rays, the ray which obeys the laws of refraction is called _________

04. The apparent change in frequency or wavelength of light due to relative motion between the source and the observer is called ________

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05. The direction in the crystal along which, both O-ray and E-ray do not separate and they travel with same speed is called _____________

06. __________ are large size sheets which are used to produce plane polarised light of large cross section.

07. Certain double refracting crystals absorb one of the two refracted rays (either O-Ray or E-Ray) and transmit the other rays. This property is called ______

08. A normal or perpendicular drawn to the surface of wavefront at any point of a wavefront, in the direction of propagation of light, is called a _______

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09. When two polaroids are _________ to each other, then the light transmitted by first polaroid is completely blocked by the second polaroid. Such combination is called Crossed polaroids

10. Restricting the vibrations of an unpolarised light only in one plane and removing the vibrations in other planes is called ______

Wave Theory Of Light 12th (MCQ With Answers)

11. The Drawbacks of Newtons Corpuscular Theory is that it cannot explain ______
(a) Interference
(b) Diffraction
(c) Polarization
(d) All of above
(e) None of above

12. If the nature and position of a wavefront at any instant is known, we can find the nature and position of a wavefront at a later instant by means of geometrical construction called ___________ Construction

13. According to Max Planck’s Quantum Theory, radiation is not continuous, but discontinuous packets of light called _______

14. Energy of Photon E = ____

15. The ratio of sine of __________ in rarer medium to sine of angle of refraction in denser medium is equal to some constant known as refractive index of denser medium with respect to rarer medium

16. The plane perpendicular to the plane of vibrations and contains no vibration is called __________

17. Luminiferous ether, proposed by Huygens Wave Theory was proved non-existent by ________ Experiment

18. Huygens Wave Theory could not explain, ____
(a) All these
(b) Polarization
(c) Compton Effect
(d) Photoelectric Effect

19. The locus of all the points of the medium to which all the waves will reach simultaneously, so that all the points are in the same state of vibration (same phase) is called _____

20. Dual Theory of Light, proposed by de Broglie, in 1923, advocates the wave-particle duality of light. Wave properties dominate when Light interacts with Light and Particle aspect is dominant when Light interacts with Particle or __________

Wave Theory Of Light 12th (MCQ With Answers)

21. A ______ can be used to change the shape of wavefront

22. The angle of incidence of ordinary light at which the reflected light from a transparent medium is completely plane polarised is called __________

23. Doppler Effect in Light: Whenever there is _________ motion between source & observer the apparent frequency perceived by observer is different from the true speed

24. The resultant wavefront at any position is given by the ___________ all the secondary wavelets at that instant
(a) parallel to
(b) perpendicular to
(c) skew to
(d) tangent to

25. In doppler effect, when the change in wavelength is negative, the apparent wavelength is less. This means that the shift is in the _____ side of spectrum. So its called ______ shift

26. Name the Law: When light is incident on refracting surface at an angle of incidence equal to polarising angle , then the Refractive Index of that medium (µ) is numerically equal to the tangent of the polarising angle

27. The surface speed of rotation of sun is _____

28. Doppler broadening in a heated gas, is proportional to ______

29. A wavefront originating from a linear source of light (slit) at finite distance is called _______ wavefront

30. The phenomenon of refraction in which two refracted rays are produced is called ___________

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Answers: Wave Theory Of Light 12th (MCQ With Answers)

01. unpolarized light (ordinary light)
02. spherical
03. Ordinary Ray (O-Ray)
04. Doppler Shift
05. Optic Axis or Crystallographic Axis
06. Polaroids
07. dichroism
08. wavenormal
09. perpendicular
10. Polarisation of Light
11. (d) All of above
12. Huygen’s
13. Quanta / Quantum / Photon
14. hγ
15. angle of incidence
16. Plane of Polarisation
17. Michelson & Morley
18. (a) All these
19. wavefront
20. Aperture
21. Lens
22. Polarising Angle or Brewster’s Angle
23. relative
24. (d) tangent to
25. Blue
26. Brewster’s Law
27. 2 km/s
28. √T
29. cylindrical
30. double refraction or Birefringence

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