Free Optics MCQs with Answers
665 Optics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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665 questions · page 10 of 34
- A. Amplitude
- B. λ
- C. Frequency
- D. None of these
Explanation: The correct option is D because The speed of light in a vacuum is a constant value and is not dependent on amplitude, wavelength (λ), or…
Correct answer: None of these- A. Will decrease
- B. Will increase
- C. Will remain the same
- D. Will disappear
Explanation: The correct option is A because The fringe spacing in Young's Double-Slit Experiment is given by λD/d , where λ is the wavelength, D is…
Correct answer: Will decrease- A. Locate wavefront
- B. Explain diffraction
- C. Determine speed of light
- D. all
Explanation: The correct option is D because Huygen's principle is a fundamental concept in wave optics.
Correct answer: all- A. λ/Ld
- B. d/ λL
- C. λL/d
- D. L/ λd
Explanation: The correct option is D because In Young's double-slit experiment, the fringe spacing (distance between consecutive bright or dark…
Correct answer: λL/d- A. Sodium chlorate
- B. Sugar solution
- C. Quartz
- D. All
Explanation: The correct option is B because An optically active substance is one that rotates the plane of polarization of polarized light passing…
Correct answer: Sugar solution- A. Selective absorption
- B. Scattering by small particles
- C. Reflection from surfaces
- D. All of these
Explanation: The correct option is D because Plane-polarized light can be achieved through various methods, including selective absorption, scattering…
Correct answer: All of these- A. Polarized light
- B. Monochromatic light
- C. Unpolarized light
- D. Ultraviolet light
Explanation: The correct option is C because An ordinary incandescent light emits unpolarized light.
Correct answer: Unpolarized light- A. Diffraction
- B. Polarization
- C. Interference
- D. All
Explanation: The correct option is A because X-rays can be used to observe diffraction phenomena.
Correct answer: Diffraction- A. Real and enlarged
- B. Virtual and enlarged
- C. Virtual and diminished
- D. Real and diminished
Explanation: The correct option is A because The objective lens of a compound microscope forms a real and magnified image of the object being observed.
Correct answer: Real and enlarged- A. Dichroic substance
- B. Solids
- C. Semiconductor
- D. All
Explanation: The correct option is A because Dichroic substances are materials that selectively transmit light waves vibrating in one plane while…
Correct answer: Dichroic substance- A. Speed of light
- B. Refraction index
- C. Wavelength (λ)
- D. Frequency
Explanation: The correct option is C because A diffraction grating is commonly used to determine the wavelength of light.
Correct answer: Wavelength (λ)- A. N x m
- B. λL/d
- C. N/m
- D. δ×λ/ λ
Explanation: The correct option is B becauseThe resolving power of a diffraction grating is determined by the formula λL/d , where λ is the wavelength…
Correct answer: λL/d- A. 10^−10 m
- B. 10^−12 cm
- C. 10^−8 m
- D. Both (a) and (b)
Explanation: The correct option is D because One angstrom (A˚) is equal to 10^−10 meters or 10^−12 centimeters.
Correct answer: Both (a) and (b)- A. Particle nature
- B. Corpuscular nature
- C. Wave nature
- D. All of these
Explanation: The correct option is C because Young's double-slit experiment provides evidence for the wave nature of light.
Correct answer: Wave nature- A. Circular wave front
- B. Plane wave front
- C. Cylindrical wave front
- D. All of these
Explanation: The correct option is B because Light from the Sun reaches the Earth in the form of a plane wave front.
Correct answer: Plane wave front- A. X-rays
- B. Ultraviolet
- C. Infrared
- D. Sound wave
Explanation: The correct option is D because Sound waves are mechanical longitudinal waves that propagate through a medium by causing particles of the…
Correct answer: Sound wave- A. Diffraction
- B. Polarization
- C. Reflection
- D. All of these
Explanation: The correct option is A because The bending of light around the edges of obstacles or through narrow openings is called diffraction.
Correct answer: Diffraction- A. Cesium
- B. Cadmium
- C. Platinum
- D. Gold
Explanation: The correct option is B because The standard meter was originally defined in terms of the wavelength of a particular spectral line of…
Correct answer: Cadmium- A. White
- B. Either a or b
- C. Dark
- D. Red
Explanation: The correct option is C because In Newton's rings experiment, the central spot for transmitted rays appears dark.
Correct answer: Dark- A. 1
- B. 3
- C. 2
- D. 4
Explanation: The correct option is C because When the movable mirror in an interferometer is moved through a distance equal to an integer number of…
Correct answer: 2