Q1. When light strikes a smooth and polished surface, what type of reflection occurs?
a) Diffuse reflection
b) Regular reflection
c) Refraction
d) Polarization
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Correct Answer: b) Regular reflection
Explanation: Regular reflection occurs when light strikes a smooth and polished surface, such as a mirror, and reflects uniformly in a single direction.
Q2. What is the angle of incidence equal to when light reflects off a surface?
a) Angle of reflection
b) Angle of refraction
c) Angle of diffraction
d) Angle of dispersion
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Correct Answer: a) Angle of reflection
Explanation: According to the law of reflection, the angle of incidence is equal to the angle of reflection when light reflects off a surface.
Q3. Which of the following surfaces produces diffuse reflection?
a) Polished metal
b) Smooth glass
c) Rough paper
d) Flat mirror
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Correct Answer: c) Rough paper
Explanation: Diffuse reflection occurs on rough surfaces like paper, where light is scattered in multiple directions due to irregularities on the surface.
Q4. What term describes the phenomenon when light bends as it passes from one medium to another?
a) Reflection
b) Refraction
c) Diffraction
d) Polarization
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Correct Answer: b) Refraction
Explanation: Refraction is the bending of light as it passes from one medium to another due to a change in speed.
Q5. What is the name given to the angle between an incident ray and the normal to a surface?
a) Angle of reflection
b) Angle of incidence
c) Angle of refraction
d) Angle of diffraction
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Correct Answer: b) Angle of incidence
Explanation: The angle between an incident ray and the normal to a surface is called the angle of incidence.
Q6. When light travels from a rarer medium to a denser medium, what happens to its speed and wavelength?
a) Speed increases, wavelength increases
b) Speed decreases, wavelength decreases
c) Speed increases, wavelength decreases
d) Speed decreases, wavelength increases
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Correct Answer: d) Speed decreases, wavelength increases
Explanation: When light travels from a rarer medium to a denser medium, its speed decreases, and its wavelength increases.
Q7. What is the name of the phenomenon where light is separated into its component colours?
a) Reflection
b) Refraction
c) Diffraction
d) Dispersion
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Correct Answer: d) Dispersion
Explanation: Dispersion occurs when light is separated into its component colours due to the varying refractive indices of different colours.
Q8. Which of the following is NOT an example of specular reflection?
a) Viewing your reflection in a mirror
b) Seeing your image in still water
c) Light bouncing off a polished surface
d) Light scattering off a rough surface
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Correct Answer: d) Light scattering off a rough surface
Explanation: Specular reflection occurs on smooth and polished surfaces, producing clear and well-defined reflections, unlike the scattering of light on rough surfaces.
Q9. What is the phenomenon called when light waves bend around obstacles or pass through small openings?
a) Reflection
b) Refraction
c) Diffraction
d) Polarization
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Correct Answer: c) Diffraction
Explanation: Diffraction occurs when light waves bend around obstacles or pass through small openings, causing them to spread out and interfere with each other.
Q10. Which law states that the angle of incidence is equal to the angle of reflection?
a) Snell’s Law
b) Huygens’ Principle
c) Fermat’s Principle
d) Law of Reflection
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Correct Answer: d) Law of Reflection
Explanation: The Law of Reflection states that the angle of incidence is equal to the angle of reflection when light reflects off a surface.