Q. In a polarizer, what happens to unpolarized light?
-
A.
It is completely absorbed
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B.
It becomes polarized
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C.
It is reflected
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D.
It is refracted
Solution
When unpolarized light passes through a polarizer, it becomes polarized, with the electric field oscillating in a specific direction.
Correct Answer:
B
— It becomes polarized
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Q. In a simple harmonic motion (SHM), what is the relationship between the period and frequency?
-
A.
T = f^2
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B.
T = 1/f
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C.
T = f
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D.
T = 2πf
Solution
The period (T) is the reciprocal of frequency (f), given by T = 1/f.
Correct Answer:
B
— T = 1/f
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Q. In Young's double-slit experiment, what causes the formation of interference patterns?
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A.
Reflection of light
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B.
Refraction of light
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C.
Superposition of waves
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D.
Diffraction of waves
Solution
The interference pattern is formed due to the superposition of waves from the two slits.
Correct Answer:
C
— Superposition of waves
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Q. What is the condition for constructive interference in two coherent waves?
-
A.
Path difference = (n + 0.5)λ
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B.
Path difference = nλ
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C.
Path difference = (n + 1)λ/2
-
D.
Path difference = (n - 0.5)λ
Solution
Constructive interference occurs when the path difference between two coherent waves is an integer multiple of the wavelength, nλ.
Correct Answer:
B
— Path difference = nλ
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Q. What is the formula for the diffraction angle in a single-slit diffraction pattern?
-
A.
a sin(θ) = nλ
-
B.
a sin(θ) = (n + 0.5)λ
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C.
a tan(θ) = nλ
-
D.
a cos(θ) = nλ
Solution
The formula for the diffraction angle in a single-slit diffraction pattern is a sin(θ) = nλ.
Correct Answer:
A
— a sin(θ) = nλ
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Q. What is the primary function of a convex lens in optical instruments?
-
A.
To diverge light rays
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B.
To converge light rays
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C.
To reflect light rays
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D.
To absorb light rays
Solution
A convex lens converges light rays that are incident on it, focusing them to a point.
Correct Answer:
B
— To converge light rays
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Q. What is the term for the maximum displacement of a wave from its equilibrium position?
-
A.
Wavelength
-
B.
Amplitude
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C.
Frequency
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D.
Period
Solution
Amplitude is defined as the maximum displacement of a wave from its equilibrium position.
Correct Answer:
B
— Amplitude
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Q. What type of polarization occurs when light waves vibrate in a single plane?
-
A.
Circular polarization
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B.
Linear polarization
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C.
Random polarization
-
D.
Elliptical polarization
Solution
Linear polarization occurs when light waves vibrate in a single plane.
Correct Answer:
B
— Linear polarization
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Q. Which optical instrument uses a concave mirror and a convex lens to magnify images?
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A.
Telescope
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B.
Microscope
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C.
Camera
-
D.
Projector
Solution
A microscope uses a concave mirror and a convex lens to magnify small images.
Correct Answer:
B
— Microscope
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Q. Which optical instrument uses a concave mirror and a convex lens?
-
A.
Telescope
-
B.
Microscope
-
C.
Camera
-
D.
Projector
Solution
A telescope typically uses a combination of a concave mirror and a convex lens to gather and focus light.
Correct Answer:
A
— Telescope
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Q. Which phenomenon explains the bending of light around obstacles?
-
A.
Reflection
-
B.
Refraction
-
C.
Diffraction
-
D.
Interference
Solution
Diffraction is the bending of waves around obstacles and openings.
Correct Answer:
C
— Diffraction
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