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 5 of 34
- A. 5000 nm
- B. 5000A
- C. 500m
- D. 2000um
Explanation: In a Michelson interferometer, moving one mirror by d changes the optical path by 2d.
Correct answer: 5000A- A. diffraction
- B. reflection
- C. polarization
- D. scattering
Explanation: The sky appears blue because air molecules scatter shorter wavelengths more strongly than longer wavelengths, and blue light is scattered…
Correct answer: scattering- A. light form fluorescent tube
- B. light form neon lamp
- C. light form sodium lamp
- D. light form simple lamp
Explanation: A sodium lamp emits light mainly at closely spaced yellow spectral lines, so it is treated as nearly monochromatic.
Correct answer: light form sodium lamp- A. vibrating plane
- B. polarization plane
- C. diffraction plane
- D. interference plane
Explanation: An optically active crystal rotates the plane in which a plane-polarized light wave vibrates, called the plane of polarization.
Correct answer: polarization plane- A. Physical science
- B. Biological science
- C. Just living science
- D. Organ science
Explanation: Biological science studies living organisms, including their structure, functions, growth and relationships.
Correct answer: Biological science- A. biological sciences
- B. physical sciences
- C. cell systems
- D. elementary physics
Explanation: Biological sciences study living things and their processes, including cells, organisms and ecosystems.
Correct answer: biological sciences- A. Physical sciences
- B. Biological sciences
- C. Social science
- D. Life sciences branch
Explanation: Physics is classified as a physical science because it studies non-living matter, energy, motion and interactions using observation and…
Correct answer: Physical sciences- A. Biology
- B. Geography
- C. Physics
- D. Chemistry
Explanation: Physics is the science that describes matter, energy, motion and their interactions, so it best matches the stated definition.
Correct answer: Physics- A. To prevent interference
- B. To prevent diffraction
- C. To perform interference
- D. To perform diffraction
Explanation: We use X-rays in crystallography because the atoms in crystals have very small spacings.
Correct answer: To perform diffraction- A. Diffraction
- B. Interference
- C. Reflection
- D. All of these
Explanation: By diffraction, x-ray wavelength is found.
Correct answer: Diffraction- A. To prevent interference
- B. To prevent diffraction
- C. To perform interference
- D. To perform diffraction
Explanation: Crystallography is the study of the arrangement of atoms in crystals. X-ray crystallography is a technique used to determine the structure…
Correct answer: To perform diffraction- A. 1m
- B. 0.1 m
- C. 50 cm
- D. 25 cm
- E. 15 cm
Explanation: The magnifying power of a telescope is given by the ratio of the focal length of the objective lens (fo) to the focal length of the…
Correct answer: 1m- A. Yellow painted
- B. Blue painted
- C. White painted
- D. Black painted
Explanation: Dark, rough, and dull surfaces absorb radiation better than light, smooth, and shiny surfaces.Black surfaces have greater absorptivity,and…
Correct answer: Black painted- A. 400-700 nanometers
- B. 300-600 nanometers
- C. 200-500 nanometers
- D. 100-400 nanometers
Explanation: The visible spectrum of light, which is the range of electromagnetic radiation that humans can see, lies between 400 and 700 nanometers.
Correct answer: 400-700 nanometers- A. To prevent interference
- B. To prevent diffraction
- C. To perform interference
- D. To perform diffraction
Explanation: X-ray beams are used to determine the structure of the crystal. The crystal diffracts the X-ray beams and the intensities and angle of…
Correct answer: To perform diffraction- A. Interference
- B. Polarization
- C. Diffraction
- D. None of these options is correct
Explanation: Davisson and L.H. Germer, in the year 1927, carried out an experiment, popularly known as Davisson Germer's experiment, to explain the…
Correct answer: Diffraction- A. vibrating plane
- B. polarization plane
- C. diffraction plane
- D. interference plane
Explanation: Optically active crystals have the property of rotating the plane of polarization of light passing through them.
Correct answer: polarization plane- A. sugar
- B. tartaric acid
- C. water
- D. sodium chlorate
Explanation: Water is not an optically active substance. Optically active substances, such as sugar and tartaric acid, exhibit optical activity by…
Correct answer: water- A. for light
- B. for an electromagnetic wave
- C. for all of the above and other situations
- D. for transverse waves
Explanation: Huygens' construction is a method used to analyze the propagation of waves, and it is applicable to transverse waves.
Correct answer: for transverse waves- A. thickness of the film only
- B. nature of the film only
- C. angle of incidence only
- D. all of thickness, nature, and angle of incidence
Explanation: When light is incident normally on a thin film, the path difference depends primarily on the thickness of the film.
Correct answer: thickness of the film only