Optics MCQ with Answers

Optics MCQ with Answers

86) The angle of incidence at which the reflected beam is fully polarized is called

Answer is:

Brewster angle

Explanation:

The angle of incidence at which the reflected beam is fully polarized is called brewster angle

87) What speed should a galaxy move with respect to us so that the sodium line at 589.0 nm is observed at 589.6 nm?

Answer is:

306 km/s

Explanation:

use difference in wavelength

88) Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when bluegreen light of wavelength 500 nm is used?

Answer is:

0.5

Explanation:

use ? = ?D/d

89) A viewing screen is separated from a double-slit source by 1.2 m. The distance between the two slits is 0.030 mm. The second-order bright fringe m =2 is 4.5 cm from the center line. Wavelength of the light is

Answer is:

560 nm

Explanation:

use ? = ?D/d

90) A viewing screen is separated from a double-slit source by 1.2 m. The distance between the two slits is 0.030 mm. The second-order bright fringe m =2 is 4.5 cm from the center line. Distance between adjacent bright fringes is

Answer is:

2.2

Explanation:

use ? = ?D/d

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