Entry Test MCQ :: Physical Optics
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21. |
appearance of colour in thin films is due to |
A. |
diffraction |
B. |
dispersion |
C. |
interference |
D. |
polarization |
Answer: Option C
Explanation:
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22. |
The blue colour of the sky is due to |
A. |
diffraction |
B. |
reflection |
C. |
polarization |
D. |
scattering |
Answer: Option D
Explanation:
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23. |
A light ray traveling form rarer to denser medium suffers a phase change of |
Answer: Option C
Explanation:
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24. |
When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used? |
Answer: Option B
Explanation:
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25. |
Diffraction effect is |
A. |
more for a round edge |
B. |
less for a round edge |
C. |
more for a sharp edge |
D. |
less for a sharp edge. |
Answer: Option C
Explanation:
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26. |
The wavelengthe of X-rays is of the order of |
Answer: Option C
Explanation:
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27. |
Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is |
A. |
4 x 10-10 m |
B. |
2 x 10-10 m |
C. |
0.02x10-10m |
D. |
20x10-10m |
Answer: Option B
Explanation:
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28. |
A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to |
A. |
500 mm |
B. |
5 x 10-3 mm |
C. |
2 x 10-5 mm |
D. |
2 x 10-3 mm |
Answer: Option D
Explanation:
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29. |
In a plane polarized light |
A. |
vibration in all direction |
B. |
vibration in two mutually perpendicular directions |
C. |
vibration take place in a direction perpendicular to the direction of propagation of light |
D. |
no vibration at all |
Answer: Option C
Explanation:
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30. |
Light on passing through a Polaroid is |
A. |
plane polarized |
B. |
un-polarized |
C. |
circularly polarized |
D. |
elliptically polarized |
Answer: Option A
Explanation:
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