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 17 of 34
- A. (2m + 1) λ = 4nt
- B. (2m + 1) λ = 2nt
- C. 2m = nt
- D. mλ = 2nt
Explanation: The explanation is given below:In thin film interference, bright circles would occur by constructive interference.
Correct answer: (2m + 1) λ = 4nt- A. Monochromatic and in Phase
- B. Monochromatic and out of Phase
- C. In phase and non - monochromatic
- D. Out of phase and non - monochromatic
Explanation: The light exhibits the phenomena of constructive interference under the situation when it is monochromatic and in phase.Monochromatic…
Correct answer: Monochromatic and in Phase- A. Interference
- B. Dispersion
- C. Polarization
- D. Scattering
Explanation: The film of oil on water shows a color pattern when illuminated by white light due to interference.Interference is a phenomenon in which…
Correct answer: Interference- A. One colour
- B. Single frequency
- C. Single wavelength
- D. All of above
Explanation: Monochromatic in science means consisting of a single wavelength of light or other radiation (lasers, for example, usually produce…
Correct answer: All of above- A. Selective diffraction
- B. Selective reflection
- C. Selective interference
- D. Selective absorption
Explanation: Polarized light can also be produced by using a tourmaline crystal. Tourmaline (a double-refracting substance) removes one of the…
Correct answer: Selective absorption- A. mλ = 2d/ sinθ
- B. 2λ =md sinθ
- C. mλ = 2d sinθ
- D. dλ = 2m sinθ
Explanation: The formula for Bragg's Law is:m𝝀 = 2d sin(θ)
Correct answer: mλ = 2d sinθ- A. 20 cm from the lens
- B. 15 cm from the lens
- C. 10 cm from the lens
- D. 5 cm from the lens
Explanation: The explanation is given below:1/f= 1/p - 1/2p1/10 = 2-1/ 2p1/10 = 1/2p 2p =10 p= 5
Correct answer: 5 cm from the lens- A. The wavelength of the diffracted rays increases
- B. The distance between the slits increases
- C. The distance from midpoints of the slits to the central of the fringe on the screen increases
- D. The distance between the screen and the slits decreases
Explanation: Increasing the wavelength of the light source or distance between the slit and the screen would increase the fringe separation.
Correct answer: The wavelength of the diffracted rays increases- A. 2 pm
- B. 1 um
- C. 2 um
- D. 1 nm
Explanation: The explanation is given below:Wavelength = slit separation x firing separation/Distance between slits and screenAll the values, of…
Correct answer: 1 um- A. By increasing the distance between light source and slits
- B. By increasing the distance from slits to the screen
- C. By increasing the distance between slits
- D. By increasing the frequency of light
Explanation: The fringe separation is directly proportional to the distance between the double-slit and the screen where the interference pattern is…
Correct answer: By increasing the distance from slits to the screen- A. Polarisation
- B. Black body radiation
- C. Compton's effect
- D. Photoelectric effect
Explanation: 'Polarisation' is the only process which indicates that light is a transverse wave.
Correct answer: Polarisation- A. 2D
- B. 3D
- C. 1D
- D. Any of these
Explanation: A scanning electron microscope (SEM) produces a three-dimensional (3D) image.
Correct answer: 3D- A. Spectrum
- B. Interference
- C. Diffraction
- D. No effect
Explanation: When photons of different colors, such as green and red, interfere with each other, they can exhibit interference patterns.
Correct answer: Interference334. A line normal to the wavefront, showing the direction of the propagation of light is called the:
- A. Tangent
- B. Radius
- C. Wavelength
- D. Ray of light
Explanation: By definition, a light ray is a line (straight or curved) that is perpendicular to the light's wavefronts.
Correct answer: Ray of light- A. Multiple wavelengths
- B. Double wavelength
- C. Single wavelength
- D. Coherent photons
Explanation: Coherent sources of light are those sources that emit a light wave having the same frequency, wavelength, and phase, or they have a…
Correct answer: Single wavelength- A. 2 x 10^-6 meter
- B. 2 x 10^-2 meter
- C. 2 x 10^-2 cm
- D. 2 x 10^-6 cm
Explanation: The explanation is given below.Grating element = 1/N = 1/500 = 0.2 * 10-2 mm = 2 * 10-3 mm = 2 * 10-6 meter.
Correct answer: 2 x 10^-6 meter- A. Optical glass should be cleaned
- B. Light should be totally confined within the fiber
- C. They are cheaper than copper wire
- D. LED light must be used
Explanation: Optical fibers typically include a core surrounded by a transparent cladding material with a lower index of refraction.
Correct answer: Light should be totally confined within the fiber- A. Polarization
- B. Refraction
- C. Interference
- D. Diffraction
Explanation: Only transverse waves can undergo polarisation. Longitudinal waves cannot undergo polarization.
Correct answer: Polarization- A. Is transmitted and reflected
- B. Is lost
- C. Remains unchanged as a whole but is redistributed
- D. Is gained
Explanation: During interference, the pattern contains both maxima and minima. This means that the energy emitted by two coherent sources is…
Correct answer: Remains unchanged as a whole but is redistributed- A. Five time small as compared with the size of the obstacle
- B. Large as compared with the mass of the obstacle
- C. Large as compared with the size of the obstacle
- D. One half as compared with the size of the obstacle
Explanation: The bending of a beam of light around the corners of the obstacles is called diffraction.
Correct answer: Large as compared with the size of the obstacle