Questions and Answers
What is meant by the reflection of light?
The bouncing back of light when it hits a surface.
What are the laws of reflection?
- The angle of incidence is equal to the angle of reflection. 2. The incident ray, the reflected ray, and the normal to the surface all lie in the same plane.
Light travels in a straight line under normal circumstances.
True
What is refraction of light?
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What happens to a pencil when it is partly submerged in water?
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What happens to light when it enters a glass slab from air?
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The velocity of light is the same in all media.
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What happens at the point of incidence on a transparent medium?
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The angle of incidence is equal to the angle of __________.
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Match the following activities with their observations:
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Study Notes
Refraction of Light
- Light generally travels in a straight line but can bend under certain conditions, which leads to the phenomenon of refraction.
- Refraction occurs when light transitions between different transparent media, causing a change in its direction.
Observation Activities
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Activity 1:
- Fill a glass with water and dip a pencil vertically; notice the apparent thickening of the submerged part.
- Observe the difference in thickness when the pencil is inclined.
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Activity 2:
- Place a 5 rupee coin in a metallic vessel and slowly step away to find the distance at which the coin appears to disappear.
- A friend fills the vessel with water until the coin becomes visible, illustrating light refraction effects.
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Activity 3:
- Draw a glass slab outline on paper and place pins to study incident and emergent rays through the slab.
Laws of Refraction
- The angle of incidence (i) is distinct from the angle of refraction (r) when light crosses the boundary between air and glass.
- When light emerges from the glass back into the air, the angle of refraction (e) corresponds to the initial angle of incidence (i1), showcasing the relationship ( i1 = r ).
Refractive Index
- The refractive index quantifies how much light slows down in a medium compared to air.
- Light travels slower in glass than in air, affecting its path and speed during refraction.
Dispersion of Light
- Dispersion occurs when white light passes through a prism, separating into its constituent colors (spectrum).
- This phenomenon illustrates the varying degrees of refraction for different wavelengths, responsible for the rainbow effect.
Summary of Refraction Observations
- Light rays bending at the interfaces of media confirms the principles of refraction and the consistency of angles in successive transitions.
- The refracted ray (MD) emerges parallel to the incident ray (AN) but is spatially displaced due to different media.
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Description
Test your knowledge on refraction of light, including its laws and refractive index. This quiz also covers key concepts like the dispersion of light and the basics of reflection. Review these fundamental principles and assess your understanding of optical phenomena.
