Podcast
Questions and Answers
Which type of light beam is emitted by a searchlight?
Which type of light beam is emitted by a searchlight?
The angle of incidence is always greater than the angle of reflection.
The angle of incidence is always greater than the angle of reflection.
False (B)
What is the name given to a mirror with a flat reflecting surface?
What is the name given to a mirror with a flat reflecting surface?
Plane mirror
A light source that emits rays that spread out in all directions is called a ______ beam.
A light source that emits rays that spread out in all directions is called a ______ beam.
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Match the following terms with their descriptions:
Match the following terms with their descriptions:
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Which of the following is NOT a luminous source of light?
Which of the following is NOT a luminous source of light?
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Light travels at a constant speed of $3 imes10^8$ m/s in a vacuum.
Light travels at a constant speed of $3 imes10^8$ m/s in a vacuum.
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The study of light's nature and propagation is known as ______.
The study of light's nature and propagation is known as ______.
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What are the three things that can happen to light when it encounters a different medium?
What are the three things that can happen to light when it encounters a different medium?
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Flashcards
Laws of Reflection
Laws of Reflection
- Incident ray, reflected ray, and normal are in the same plane. 2. Angle of incidence equals angle of reflection.
Divergent Beam
Divergent Beam
A beam of light that spreads outwards from a source, like from a bulb.
Convergent Beam
Convergent Beam
A beam of light that comes together at a point, typically after passing through a convex lens.
Plane Mirror
Plane Mirror
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Normal Line
Normal Line
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Luminous Source
Luminous Source
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Non-Luminous Object
Non-Luminous Object
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Reflection of Light
Reflection of Light
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Geometrical Optics
Geometrical Optics
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Speed of Light
Speed of Light
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Study Notes
Chapter 8 - Light
- Light travels in a straight line in a uniform medium (vacuum, air, or water)
- When light encounters a different medium, part is absorbed, some is reflected, and the rest is transmitted
- Learning Outcomes:
- Students will identify sources of light
- Students will examine the laws of reflection and the reflection of light at plane and curved surfaces
- Apply basic knowledge of optics, to optical phenomena
- Students will draw ray diagrams for reflection of light at plane and curved surfaces.
- Optics is the study of nature and propagation of light
- Divided into geometrical and physical optics
- Geometrical optics is based on the fact that light travels in a straight line. Ray diagrams are used in explaining optical phenomena.
- Physical optics is based on the wave motion of light
- Sources of Light:
- Luminuous sources (sun, stars, fluorescent lamps, candles) - make their own light
- Non-luminous objects (most objects) do not emit light but reflect it
- Speed of Light: Electromagnetic radiation (including light) travels at a constant speed of 3 x 10⁸ m/s in a vacuum.
8.2 Reflection of Light
- When light is incident on a surface, some of the light is sent back (reflection)
- A ray of light is a path along which light travels, shown with an arrow-head.
- A beam of light is a collection of light rays
- Parallel rays
- Convergent rays
- Divergent rays
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Description
This quiz covers key concepts from Chapter 8 on Light, including the behavior of light in different media, laws of reflection, and ray diagrams. Students will explore both geometrical and physical optics, identifying sources of light and understanding optical phenomena. Test your knowledge of how light travels and interacts with various surfaces.
