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 19 of 34
- A. Its frequency and wavelength both stay the same
- B. Its frequency stays the same but its wavelength increases
- C. Its frequency increases but its wavelength stays the same
- D. Its frequency decreases and wavelength increases
Explanation: When monochromatic (single wavelength) light travels from a glass into the air, its frequency remains the same but its wavelength…
Correct answer: Its frequency stays the same but its wavelength increases- A. Optical Pumping
- B. Excitation
- C. Bremsstrahlung
- D. Holography
Explanation: Optical pumping suggests that the method of creating an inverted population is called optical pumping.
Correct answer: Optical Pumping- A. 20 cm
- B. 30cm
- C. 25cm
- D. 40cm
Explanation: This option suggests that the least distance of distinct vision for a normal eye is 25 cm. This is the correct value.
Correct answer: 25cm- A. ∆Y = λL/d
- B. ∆Y = λ/dL
- C. ∆Y = λd/L
- D. ∆Y = d/λL
Explanation: This option represents the mathematical expression for the distance between two dark adjacent fringes.
Correct answer: ∆Y = λL/d- A. Optical Center
- B. Infinity
- C. Principle Focus
- D. Near Point
Explanation: This option is the correct position for the final image in the normal adjustment of a compound microscope.
Correct answer: Infinity- A. Longitudinal wave
- B. Compressional wave
- C. Transverse wave
- D. Electromagnetic wave
Explanation: Polarization of light is a phenomenon that occurs when a transverse wave such as light is restricted to vibrating in a particular plane.
Correct answer: Transverse wave- A. Un-polarized light
- B. Plane polarized light
- C. Interference of light
- D. Diffraction of light
Explanation: The concentration of a sugar solution can be determined using a technique called polarimetry, which involves the use of plane-polarized…
Correct answer: Plane polarized light- A. Copper wire
- B. Aluminium wire
- C. Photodiode
- D. Optical fibre
Explanation: Optical fiber is a technology that allows the transmission of information from one place to another using light signals.
Correct answer: Optical fibre- A. Less than 25 cm
- B. Near point
- C. Greater than 25 cm
- D. Infinity
Explanation: When an object is placed inside the focal length of a convex lens, a virtual, upright, and magnified image is formed on the same side of…
Correct answer: Near point- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Monochromatic light passing through a single slit has a central maximum and many smaller and dimmer maxima on either side.
Correct answer: Option C- A. Least Point
- B. Near Point
- C. Far Point
- D. Distinct Point
Explanation: Near point is the point nearest the eye at which an object is accurately focused on the retina at full accommodation, making a sharp image.
Correct answer: Near Point- A. Diffraction
- B. Polarization
- C. Interference
- D. Surface tension
Explanation: The bright colors seen in an oil slick floating on water or in a sunlight, soap bubble are caused by interference.
Correct answer: Interference- A. M = -220
- B. M = -0.19
- C. M = -0.05
- D. M = 220
Explanation: The explanation is given below:To find the total magnification of two lenses combined we must multiply individual magnifications:20x11 =…
Correct answer: M = 220- A. λ = 0.60 nm
- B. λ = 0.30 nm
- C. λ = 0.20 nm
- D. λ = 0.90 nm
Explanation: The explanation is given below:According to Bragg's law:2dsine=nX 2(0.3*10^-9) sin(30)=1λ=0.3x10^-9= 0.3nm
Correct answer: λ = 0.30 nm375. The minimum distance from the eye at which an object can be seen clearly without strain is called:
- A. Focal point
- B. Near point
- C. Yield point
- D. Far point
Explanation: The near point is the minimum distance from the eye at which an object can be seen clearly without strain.
Correct answer: Near point- A. The wavelength of incident light waves is increased
- B. The wavelength of incident light waves is decreased
- C. The amplitude of the incident light wave is increased
- D. The amplitude of the incident light wave is decreased
Explanation: In the diffraction of light around an obstacle, the angle of diffraction is directly related to the wavelength of the incident light wave.
Correct answer: The wavelength of incident light waves is increased- A. +15 cm
- B. +20 cm
- C. +10 cm
- D. +25 cm
Explanation: A real image can only be produced by a convex lensSo,v= +30 and u= -15The formula of the lens is 1/f=1/v-1/unow putting values1/f=…
Correct answer: +10 cm- A. A
- B. B
- C. C
- D. D
Explanation: The critical angle (θc) in the case of light passing from a medium with a higher refractive index (n1) to a medium with a lower refractive…
Correct answer: D- A. Particle nature of light
- B. Wave nature of light
- C. Dual nature of light
- D. None of the above
Explanation: When light behaves like electromagnetic radiation and travels in a straight line it shows the wave nature of light.
Correct answer: Wave nature of light- A. Centre will be bright and red color will be far from it
- B. Centre will be bright and blue color will be far from it.
- C. Centre will be dark and red color will be to it
- D. Centre will be dark and blue color will be to it
Explanation: When we use white light in place of monochromatic light then only the central fringe looks white and other fringes of different colors are…
Correct answer: Centre will be bright and red color will be far from it