Polarization (Plane-Polarized Light: Brewster's Law, Uses of Plane-Polarized Light and Polaroid) NEET Questions

Physics - Optics

Polarization (Plane-Polarized Light: Brewster's Law, Uses of Plane-Polarized Light and Polaroid) MCQ Questions


13.
Light of wavelength 6000 Å is incident on a glass surface at Brewster's angle. The wavelength of the reflected light is:
A.
Cannot be determined
B.
3000 Å
C.
6000 Å
D.
12000 Å
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ANSWER :
C. 6000 Å
14.
The Brewster's angle for diamond (μ = 2.42) is approximately:
A.
45°
B.
57°
C.
22.5°
D.
67.5°
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ANSWER :
D. 67.5°
15.
If the critical angle for a medium is C and Brewster's angle is iₚ, then the relation between them is:
A.
tan(iₚ) = cosec(C)
B.
tan(iₚ) = sin(C)
C.
tan(iₚ) = tan(C)
D.
tan(iₚ) = cos(C)
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ANSWER :
A. tan(iₚ) = cosec(C)
16.
The polarizing angle for a medium is 60°. The angle of refraction at this incidence is:
A.
90°
B.
30°
C.
45°
D.
60°
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ANSWER :
B. 30°
17.
When unpolarized light passes through a single ideal polaroid, the intensity of the transmitted light is:
A.
Equal to the incident intensity
B.
Zero
C.
One-fourth of the incident intensity
D.
Half of the incident intensity
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ANSWER :
D. Half of the incident intensity
18.
A polaroid consists of:
A.
Short crystalline molecules randomly oriented
B.
Liquid crystals in nematic phase
C.
Long chain molecules aligned in a particular direction
D.
Optically active sugar molecules
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ANSWER :
C. Long chain molecules aligned in a particular direction