Wave Optics Quiz - CBSE Class 12 Physics
Free practice quiz: Wave Optics (CBSE Class 12 Physics). 11 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which phenomenon demonstrates the wave nature of light?
- Photoelectric effect
- Compton scattering
- Diffraction
- Blackbody radiation
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Answer: C. Diffraction
Diffraction is the bending of waves around obstacles or through apertures, a phenomenon exhibited by both light and sound waves, thus demonstrating its wave nature.
What is the phenomenon where light bends when passing from one medium to another?
- Diffraction
- Interference
- Polarization
- Refraction
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Answer: D. Refraction
Refraction is the bending of light as it passes from one medium to another due to a change in the speed of light.
In a single slit diffraction experiment, what happens to the width of the central maximum as the slit width decreases?
- Increases
- Decreases
- Remains the same
- Becomes zero
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Answer: A. Increases
The width of the central maximum is inversely proportional to the slit width. A narrower slit leads to a wider central maximum.
Derive the expression for the fringe width in Young's double slit experiment.
- β = λD/d
- β = λd/D
- β = Dd/λ
- β = 2λD/d
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Answer: A. β = λD/d
The derivation involves considering the path difference and geometry of the setup, leading to the expression β = λD/d, where β is the fringe width, λ is the wavelength, D is the distance to the screen, and d is the slit separation.
A Michelson interferometer is used to measure the wavelength of light. If 100 fringes pass by as one mirror is moved by 0.02 mm, what is the wavelength of the light?
- 400 nm
- 500 nm
- 600 nm
- 700 nm
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Answer: A. 400 nm
In a Michelson interferometer, a path difference of λ corresponds to one fringe shift. A path difference of 2(0.02 mm) = 0.04 mm corresponds to 100 fringes. Therefore, 100λ = 0.04 mm, so λ = 400 nm.