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 9 of 34
- A. Diodes
- B. Repeaters
- C. Laser
- D. Transformers
Explanation: Repeaters are used in optical fiber transmission systems to amplify and regenerate weak light signals to maintain the integrity of the…
Correct answer: Repeaters- A. f₀ + fₑ
- B. f₀/ fₑ
- C. fₑ/ f₀
- D. (1+ f0/ fe )× L/ f0)
Explanation: The magnification (M) of an astronomical telescope is given by M=(1+fe f0 )×f0 L , where f0 is the focal length of the objective lens, fe…
Correct answer: f₀ + fₑ- A. Newton
- B. Einstein
- C. Michelson
- D. Planck
Explanation: The equation amin =1.22DA is associated with Michelson's interferometer.
Correct answer: Michelson- A. Spectrometer
- B. Galvanometer
- C. Interferometer
- D. None of these
Explanation: Michelson used an interferometer to measure the speed of light. His method involved measuring the time taken for light to travel a known…
Correct answer: Interferometer- A. c=4fd
- B. c=8fd:
- C. c=16fd
- D. c=5fd/2
Explanation: Michelson's formula to calculate the speed of light is c=2d×f, where c is the speed of light, d is the distance traveled by light, and f…
Correct answer: c=16fd- A. To produce a parallel beam of light
- B. To make them mutually perpendicular
- C. To filter the light
- D. No function
Explanation: The collimator in a spectrometer is used to produce a parallel beam of light from the source.
Correct answer: To produce a parallel beam of light- A. 300 km
- B. 200 km
- C. 100 km
- D. 20 km
Explanation: In optical fiber transmission systems, repeaters are used to amplify and regenerate the optical signals.
Correct answer: 100 km- A. Red
- B. Blue
- C. Orange
- D. Green
Explanation: The angle of deviation in a prism is dependent on the wavelength of light.
Correct answer: Blue- A. Longer wavelength light
- B. shorter wavelength light
- C. Wavelength has no effect.
- D. It depend only on design of microscope not on a light.
Explanation: The resolving power of a microscope is determined by its ability to distinguish between two closely spaced objects.
Correct answer: shorter wavelength light- A. hc/λ
- B. h/me
- C. h/mc
- D. hc/E
Explanation: The Compton wavelength (λc ) is given by λc =h/mc , where h is Planck's constant, m is the mass of the particle, and c is the speed of…
Correct answer: h/mc- A. kinetic energy of all the emitted electrons
- B. mean kinetic energy of emitted electrons
- C. maximum kinetic energy of emitted electrons
- D. minimum kinetic energy of emitted electrons
Explanation: In Einstein's photoelectric equation, Ex =hf, Ex represents the maximum kinetic energy of emitted electrons.
Correct answer: maximum kinetic energy of emitted electrons- A. infrared
- B. visible
- C. ultraviolet
- D. yellow
Explanation: Here's the explanation:Photoelectric Effect:Sodium and potassium, along with other alkali metals like caesium, exhibit the photoelectric…
Correct answer: ultraviolet- A. mc²
- B. 1/2mv²
- C. mgh
- D. hf
Explanation: The energy of a photon (a particle of light) is given by the equation E=hf, where h is Planck's constant and f is the frequency of the…
Correct answer: hf- A. Reflection
- B. Diffraction
- C. Double refraction
- D. Scattering
Explanation: Scattering does not generally result in the conversion of unpolarized light to partially or plane polarized light.
Correct answer: Scattering- A. Doppler effects
- B. organ pipe
- C. beats
- D. none of these
Explanation: Metal detectors work on the principle of electromagnetic induction, which is not represented in the given options.
Correct answer: none of these- A. wave nature
- B. particle nature
- C. dual nature
- D. all of these:
Explanation: The correct option is (c). According to modern physics, light exhibits both wave-like and particle-like properties.
Correct answer: dual nature- A. Proton
- B. Corpuscles
- C. Wave front
- D. Electron
Explanation: The correct option is (c). According to Huygens's wave theory of light, light travels in the form of wave fronts, where each point on a…
Correct answer: Wave front- A. Wave nature
- B. Particle nature
- C. Quantum nature
- D. Electromagnetic nature
Explanation: The correct option is A.Interference and polarization are phenomena that can be explained by the wave nature of light.
Correct answer: Wave nature- A. Slits separation
- B. λ
- C. Distance of screen from slits
- D. Area of slit
Explanation: The correct option is B The fringe width in interference patterns is inversely proportional to the wavelength (λ) of light.
Correct answer: λ- A. 2×10^−2 m
- B. 2×10^−2 cm
- C. 2×10^−6 m
- D. 2×10^−6 cm
Explanation: The correct option is C because Grating element refers to the distance between two successive slits or lines in a diffraction grating.
Correct answer: 2×10^−6 m