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 30 of 34
- A. The sources should be phase coherent
- B. The sources should be monochromatic
- C. The principle of superposition should be applicable
- D. All of the above
Explanation: To observe interference in light waves, all the given conditions must be satisfied.
Correct answer: All of the above- A. d \(\sin \theta = m\lambda\)
- B. 2d \(\sin \theta = m\lambda\)
- C. d \(\sin \theta = 2m\lambda\)
- D. d \(\sin \theta = m + 1\)
Explanation: Bragg's law is given by the formula 2d \(\sin \theta = m\lambda\), where \(d\) is the distance between crystal planes, \(\theta\) is the…
Correct answer: 2d \(\sin \theta = m\lambda\)- A. X-rays
- B. Light rays
- C. Water waves
- D. Sound waves
Explanation: The correct answer is Sound waves because they are longitudinal waves, which means their oscillations occur in the same direction as the…
Correct answer: Sound waves- A. Transverse waves
- B. Longitudinal waves
- C. Both transverse and longitudinal waves
- D. None of these
Explanation: Polarization refers to the orientation of the oscillations in a wave. It can only occur in transverse waves, where the oscillations are…
Correct answer: Transverse waves- A. The same frequencies
- B. Slightly different frequencies
- C. Slightly different amplitudes
- D. The same time periods
Explanation: Beats occur when two sound waves of similar amplitudes and slightly different frequencies interfere with each other.
Correct answer: Slightly different frequencies- A. Diffraction
- B. Constructive interference
- C. Constructive and destructive interference
- D. None of these
Explanation: Beats are the result of both constructive and destructive interference.
Correct answer: Constructive and destructive interference- A. Reflection
- B. Refraction
- C. Interference
- D. Polarization
Explanation: The correct answer is Interference. Beats are produced when two sound waves of slightly different frequencies interfere with each other.
Correct answer: Interference- A. Intensity
- B. Frequency
- C. Velocity
- D. Energy
Explanation: The Doppler effect describes the change in frequency (or wavelength) of a wave relative to an observer who is moving relative to the…
Correct answer: Frequency- A. Less than the frequency of sound produced by the source
- B. Greater than the frequency of sound produced by the source
- C. Same as that produced by the source
- D. Zero
Explanation: The correct answer is that the frequency received by the listener is greater than the frequency of the sound produced by the source.
Correct answer: Greater than the frequency of sound produced by the source- A. 1460m
- B. 5840m
- C. 2920m
- D. 4800m
Explanation: The key to solving this problem is understanding that the 4 seconds given in the problem is for the entire round trip of the sound wave…
Correct answer: 2920m- A. 31.3 cm
- B. 66.0 cm
- C. 93.8 cm
- D. 132 cm
Explanation: In a pipe closed at one end, the fundamental frequency is achieved when the length of the air column equals one-fourth of the wavelength…
Correct answer: 66.0 cm- A. Great distance of distinct vision
- B. Normal distance of distinct vision
- C. Least distance of distinct vision
- D. None of these
Explanation: The correct answer is Least distance of distinct vision. This term defines the closest point at which the eye can focus on an object…
Correct answer: Least distance of distinct vision- A. Large
- B. Small
- C. Both A and B
- D. None of these
Explanation: The objective lens in a compound microscope is designed to have a small focal length.
Correct answer: Small- A. Very large
- B. Very small
- C. Variable
- D. Moderate
Explanation: The correct answer is Very small. Telescopes use eye-pieces with very small focal lengths to maximize magnification, allowing observers to…
Correct answer: Very small- A. Holography
- B. Tomography
- C. Scanning
- D. 3-D Cinema
Explanation: Holography is a technique that uses laser beams to create a hologram, which is a three-dimensional image of an object.
Correct answer: Holography- A. Concave lens of 0.5m focal length
- B. Convex lens of 0.5m focal length
- C. Concave lens of 1m focal length
- D. Convex lens of 1m focal length
Explanation: Power of the lensP = P1 + P2P1 =4 (convex lens)P2 = -3 (concave lens)P = 4-3P = 1Focal length = Focal length = 1 (The positive power…
Correct answer: Convex lens of 1m focal length- A. Concave lens of 0.5m focal length
- B. Convex lens of 0.5m focal length
- C. Concave lens of 1m focal length
- D. Convex lens of 1m focal length
Explanation: Power of the lensP = P1 + P2 P1 =4 (convex lens)P2 = -3 (concave lens) P = 4-3P = 1 Focal length = Focal length = 1 (The positive power…
Correct answer: Convex lens of 1m focal length- A. Refraction.
- B. Diffraction.
- C. Interference.
- D. Polarisation.
Explanation: The correct answer is polarisation. Polarisation is a property unique to transverse waves, where the oscillations occur in a particular…
Correct answer: Polarisation.- A. Photographers use filters to reduce glare and achieve clearer images.
- B. Drivers use sunglasses to reduce glare from the road and other vehicles.
- C. Fishermen use eyewear to minimize reflections off the water surface.
- D. Astronomers use lenses in telescopes to magnify images of celestial objects.
Explanation: The correct answer is Option B. Polarized sunglasses are designed to reduce glare from reflective surfaces like roads and water, but they…
Correct answer: Astronomers use lenses in telescopes to magnify images of celestial objects.600. All of the following are different applications of polarised sunglasses in our daily life EXCEP to
- A. Spot fishes in the water.
- B. Protect eyes from ultraviolet rays.
- C. Reduce the glare of headlights of cars.
- D. Locate atoms on the surface of a heated filament.
Explanation: Polarised sunglasses are designed to reduce glare from surfaces like water, glass, and roads, which helps in activities such as spotting…
Correct answer: Locate atoms on the surface of a heated filament.