Physics MCQs

Physics

Physical Optics


Page 6 of 17

#41

In a thin film, the path difference depends on the:

A) Wavelength only

B) Thickness only

C) Angle of incidence only

D) Thickness, angle of refraction, and wavelength

Answer:   D
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#42

An instrument that can be used to measure the wavelength of light very accurately is the:

A) Telescope

B) Microscope

C) Diffraction grating

D) Prism

Answer:   C
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#43

The blue color of the sky is a result of:

A) Interference

B) Diffraction

C) Scattering

D) Polarization

Answer:   C
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#44

Which phenomenon occurs when the size of the obstacle is comparable to the wavelength of light?

A) Reflection

B) Refraction

C) Diffraction

D) Polarization

Answer:   C
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#45

For a wave, the product of its frequency and wavelength is equal to its:

A) Amplitude

B) Speed

C) Period

D) Energy

Answer:   B
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#46

In the equation \( d \sin\theta = m\lambda \) for a grating, the symbol 'm' represents:

A) Mass

B) The order of the spectrum

C) The number of slits

D) The fringe width

Answer:   B
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#47

A light wave is traveling in a vacuum. Which of its properties changes when it enters glass?

A) Frequency

B) Wavelength

C) Speed

D) Both B and C

Answer:   D
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#48

The principle which states that every point on a wavefront is a source of secondary wavelets is called:

A) Superposition principle

B) Huygens' principle

C) Fermat's principle

D) Rayleigh's principle

Answer:   B
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Page 6 of 17