Q1. When white light passes through a glass prism, which color of light experiences the least deviation?
a) Red
b) Blue
c) Green
d) Yellow
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Correct Answer: a) Red
Explanation: In a glass prism, red light experiences the least deviation because it has the longest wavelength among the colours of the visible spectrum.
Q2. What is the angle between the two refracted rays after passing through a prism called?
a) Angle of incidence
b) Angle of refraction
c) Angle of deviation
d) Angle of dispersion
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Correct Answer: c) Angle of deviation
Explanation: The angle between the two refracted rays after passing through a prism is called the angle of deviation, which depends on the refractive index of the prism and the angle of incidence.
Q3. What term describes the spreading out of white light into its component colours when passing through a prism?
a) Reflection
b) Refraction
c) Dispersion
d) Diffraction
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Correct Answer: c) Dispersion
Explanation: Dispersion is the spreading out of white light into its component colours (spectrum) due to differences in refractive indices for different colours of light.
Q4. Which colour of light experiences the most deviation when passing through a glass prism?
a) Red
b) Blue
c) Green
d) Yellow
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Correct Answer: b) Blue
Explanation: Blue light experiences the most deviation when passing through a glass prism because it has the shortest wavelength among the coloursof the visible spectrum.
Q5. What is the minimum number of colours produced when white light passes through a prism?
a) Three
b) Five
c) Seven
d) Nine
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Correct Answer: c) Seven
Explanation: White light produces a spectrum of colours when passing through a prism, typically consisting of seven colours: red, orange, yellow, green, blue, indigo, and violet.
Q6. What term describes the angle at which a ray of light enters a prism?
a) Angle of incidence
b) Angle of refraction
c) Angle of deviation
d) Angle of dispersion
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Correct Answer: a) Angle of incidence
Explanation: The angle at which a ray of light enters a prism is called the angle of incidence, measured between the incident ray and the normal to the surface of the prism.
Q7. What is the name given to the angle between the emergent ray and the refracted ray after passing through a prism?
a) Angle of incidence
b) Angle of refraction
c) Angle of deviation
d) Angle of dispersion
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Correct Answer: c) Angle of deviation
Explanation: The angle between the emergent ray and the refracted ray after passing through a prism is called the angle of deviation.
Q8. Which of the following factors affects the amount of dispersion when white light passes through a prism?
a) The refractive index of the prism
b) The angle of incidence
c) The colour of the light
d) The size of the prism
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Correct Answer: a) The refractive index of the prism
Explanation: The amount of dispersion when white light passes through a prism depends on the refractive index of the prism, with higher refractive indices leading to greater dispersion.
Q9. What is the phenomenon called when the emergent ray from a prism is parallel to the incident ray?
a) Total internal reflection
b) Minimum deviation
c) Maximum deviation
d) Critical angle
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Correct Answer: b) Minimum deviation
Explanation: Minimum deviation occurs when the emergent ray from a prism is parallel to the incident ray, resulting in the least deviation of light.
Q10. Which colour of light deviates the most when passing through a glass prism?
a) Red
b) Yellow
c) Green
d) Violet
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Correct Answer: d) Violet
Explanation: Violet light deviates the most when passing through a glass prism because it has the shortest wavelength among the colours of the visible spectrum, leading to greater refraction.