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 32 of 34
- A. Distance
- B. Time
- C. Intensity of light
- D. Velocity
Explanation: A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles or 9.7…
Correct answer: Distance- A. Wavelength of photons
- B. Wave number of photons
- C. Energy of photons
- D. Frequency of photons
Explanation: Explanation:The extent of bonding of a light ray after passing through prism depends upon wavelength of photons.
Correct answer: Wavelength of photons- A. c = 2 fd
- B. c = 2π f / d
- C. c = 16 f / d
- D. c = 16 fd
Explanation: Explanation:c = 16fd is the correct formula to calculate the speed of light in Michelson's Experiment.
Correct answer: c = 16 fd- A. λ/4
- B. λ/2
- C. λ
- D. λ/3
Explanation: The correct answer is λ/2. In the Newton ring apparatus, when light reflects off the lens and glass plate at the point of contact, a phase…
Correct answer: λ/2- A. λ / Δλ
- B. λ / D
- C. λ / λ1
- D. N x m
Explanation: The resolving power 'R' of a grating is defined by the formula R = λ / Δλ, where 'λ' is the wavelength and 'Δλ' is the smallest difference…
Correct answer: λ / Δλ- A. Visible light
- B. Ultraviolet light
- C. Ordinary light
- D. Invisible infrared light
Explanation: Infrared light travels fastest in optical fibers due to its longer wavelength, which minimizes scattering and absorption.
Correct answer: Invisible infrared light- A. Diffraction of Light
- B. Polarization of Light
- C. Quantization of Light
- D. Interference of Light
Explanation: The phenomenon of bending of light around the corners of obstacles in the path of light and spreading into the regions of geometrical…
Correct answer: Diffraction of Light- A. 20 cm
- B. 25 cm
- C. 10 cm
- D. 15 cm
Explanation: The near point of the eye is the minimum distance of the object from the eye, which can be seen distinctly without strain.
Correct answer: 25 cm- A. 25 cm
- B. 22 cm
- C. 35 cm
- D. 20 cm
Explanation: This is approximately 25 cm from the eye. The normal human eye can focus a sharp image of an object on the eye if it is located anywhere…
Correct answer: 25 cm- A. 5
- B. 7
- C. 6
- D. 8
Explanation: Using M= 1 + d/f Putting values given in the question M= 1+25/5 M= 1+5=6
Correct answer: 6- A. Expanding
- B. Contracting
- C. Stationary
- D. Oscillating
Explanation: The Doppler red-shift of light observed from distant stars and galaxies gives evidence that the universe is expanding (moving away from a…
Correct answer: Expanding- A. 6 x 10^-7 m
- B. 4 x 10^-6 m
- C. 5 x 10^-7 m
- D. 3 x 10^-6 m
Explanation: We know, for diffraction grating: dsin𝜭=m𝞴 Where d is the reciprocal of lines per centimeter.
Correct answer: 5 x 10^-7 m- A. Suffers no phase change
- B. Undergoes a phase change of 180° ·
- C. Undergoes a phase change of 270° ·
- D. Undergoes of 90°
Explanation: When light waves hit the boundary of a denser medium, some of it is transmitted/refracted and some is reflected.
Correct answer: Undergoes a phase change of 180° ·- A. Suffers no phase change
- B. Undergoes a phase change of 180°
- C. Undergoes a phase change of 270°
- D. Undergoes a phase change of 90°
Explanation: When light waves hit the boundary of a denser medium, some of it is transmitted/refracted and some is reflected.
Correct answer: Undergoes a phase change of 180°- A. 10 cm
- B. 12 cm
- C. 14 cm
- D. 16 cm
Explanation: We know the formula 1/f = 1/v - 1/u, where f = focal length of lens, v = distance of image from lens & u = distance of object from lens…
Correct answer: 12 cm- A. Lens of short focal length
- B. Lens of large focal length
- C. Light of short wavelength
- D. Light of large wavelength
Explanation: Resolution depends on the wavelength of the light source. The smaller the wavelength, the greater the resolution.
Correct answer: Light of short wavelength- A. Speed of light
- B. wavelength of light
- C. Refractive index of the medium
- D. intensity of light
Explanation: The critical angle is the angle of incidence, which corresponds to an angle of refraction of 90 degrees when light travels from a denser…
Correct answer: Refractive index of the medium- A. 5x100
- B. 5x10m
- C. 500 nm
- D. 50mm
Explanation: This question deals with a Michaelson interferometer. The Michelson interferometer produces interference fringes by splitting a beam of…
Correct answer: 500 nm- A. Real inverted , in front of the lens
- B. Virtual, erect, in front of the lens
- C. Real erect behind the lens
- D. Real inverted behind the lens
Explanation: When an object is placed between a convex lens and its focus, the image formed is virtual, erect, and located on the same side as the…
Correct answer: Virtual, erect, in front of the lens- A. Real, erect
- B. Real inverted
- C. Virtual inverted
- D. Virtual erect
Explanation: The objective lens produces a real, inverted image and the eyepiece acts as a simple magnifier and does not re-invert and produces a…
Correct answer: Virtual inverted