Refraction of Light Quiz - CBSE Class 12 Physics
Free practice quiz: Refraction of Light (CBSE Class 12 Physics). 16 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
This CBSE Class 12 Physics practice quiz has 16 multiple-choice questions on Refraction of Light, and 16 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.
Start quiz: 16 questions, freeSample questions
A ray of light passes from air into glass. Which of the following statements is true?
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Answer: D. The wavelength of light decreases.
When light passes from a rarer medium (air) to a denser medium (glass), its speed decreases. Since the frequency of light remains constant, the wavelength must decrease according to the relation v = fλ (where v is speed, f is frequency, and λ is wavelength).
What is the critical angle?
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Answer: A. The angle of incidence at which the angle of refraction is 90°.
The critical angle is defined as the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is 90°.
Explain how the refractive index of a liquid can be determined using a spectrometer.
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Answer: A. By measuring the angle of minimum deviation.
A spectrometer can be used to precisely measure the angle of minimum deviation for a prism made of the liquid. This angle is then used to calculate the refractive index of the liquid using the prism formula.
What is the phenomenon responsible for the twinkling of stars?
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Answer: C. Refraction of starlight
The twinkling of stars is due to atmospheric refraction of starlight. The density of air in the atmosphere fluctuates, causing the light to bend slightly in varying amounts, resulting in the apparent twinkling.
Explain the phenomenon of mirage.
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Answer: C. Due to refraction of light
Mirages are an optical illusion caused by refraction of light. The density of air near the ground changes with temperature, creating layers with different refractive indices. This causes light rays to bend, creating the appearance of water or other objects.
More questions in this quiz
Answers and explanations are in the full quiz.
- What is the refractive index of a medium?
- Explain total internal reflection.
- Derive the formula for the refractive index in terms of the critical angle.
- Describe the application of total internal reflection in optical fibers.
- Two transparent media A and B are separated by a plane boundary. If the speed of light in A is twice that in B, what is the ratio of the refractive indices of A and B?
- A ray of light is incident on a plane refracting surface. Which of the following quantities remain unchanged during refraction?
- Why does a pencil appear bent when partially submerged in water?
- What is the condition for no refraction of light at a boundary between two media?
- What is the relation between the angle of incidence (i), angle of refraction (r) and the refractive indices of two media (n1, n2)?
- Explain how a prism disperses white light into its constituent colors.
- Design an experiment to determine the refractive index of a transparent liquid using a plane mirror, a traveling microscope, and the liquid.