Podcast
Questions and Answers
What type of reflection occurs when light is reflected from a smooth surface?
What type of reflection occurs when light is reflected from a smooth surface?
- Regular Reflection (correct)
- Irregular Reflection
- Diffuse Reflection
- Scattered Reflection
How does light behave when it travels from a rarer medium to a denser medium?
How does light behave when it travels from a rarer medium to a denser medium?
- It remains unaffected.
- It speeds up and bends away from the normal.
- It slows down and bends towards the normal. (correct)
- It reflects but does not refract.
Which of the following is an example of diffused reflection?
Which of the following is an example of diffused reflection?
- A polished metal surface.
- Light bouncing off a rough wall. (correct)
- A CD reflecting light.
- Calm water reflecting the sky.
What is the bending of light as it passes through different media called?
What is the bending of light as it passes through different media called?
Which of the following best describes a denser medium?
Which of the following best describes a denser medium?
What role does the angle of incidence play in the behavior of light?
What role does the angle of incidence play in the behavior of light?
Which statement about light traveling through a vacuum is true?
Which statement about light traveling through a vacuum is true?
What happens in regular reflection compared to diffused reflection?
What happens in regular reflection compared to diffused reflection?
What happens to light when it travels from air to glass?
What happens to light when it travels from air to glass?
Which of the following statements best describes optically denser media?
Which of the following statements best describes optically denser media?
Which medium is considered to be optically rarer?
Which medium is considered to be optically rarer?
When light exits glass and enters air, what change occurs?
When light exits glass and enters air, what change occurs?
What is the primary reason light travels slower in denser materials?
What is the primary reason light travels slower in denser materials?
What is the result of refraction when light moves from denser to rarer media?
What is the result of refraction when light moves from denser to rarer media?
In which of the following scenarios does light travel faster?
In which of the following scenarios does light travel faster?
Flashcards
Regular Reflection
Regular Reflection
Light bouncing off a smooth surface in a single, uniform direction.
Diffused Reflection
Diffused Reflection
Light bouncing off a rough surface in many different directions.
Refraction
Refraction
The bending of light as it passes from one medium to another.
Denser Medium
Denser Medium
A medium where light travels slower.
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Rarer Medium
Rarer Medium
A medium where light travels faster.
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Angle of incidence
Angle of incidence
The angle between the incident ray and the normal to the surface.
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Angle of refraction
Angle of refraction
The angle between the refracted ray and the normal to the surface.
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Reflected ray
Reflected ray
The ray of light that bounces off a surface.
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Optical Density
Optical Density
A measure of how much light slows down when it passes through a material. Denser materials have closer particles, causing light to travel slower. Rarer materials have further apart particles, allowing light to travel faster.
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Light Bending: Air to Glass
Light Bending: Air to Glass
When light travels from air (rarer medium) to glass (denser medium), it slows down and bends towards the normal line.
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Light Bending: Glass to Air
Light Bending: Glass to Air
When light travels from glass (denser medium) to air (rarer medium), it speeds up and bends away from the normal line.
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Normal Line
Normal Line
An imaginary line perpendicular to the surface at the point where light hits it. It helps understand the angles of incidence and refraction.
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Incident Ray
Incident Ray
The ray of light that strikes the surface of a medium.
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Waves and Their Applications - Unit 1, Module L
- Standard: MS-PS4-2 Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials.
Day 1 - Regular & Diffused Reflection/Refraction
- Objectives: Define regular and diffused reflection, define refraction, label reflected and refracted ray diagrams, explain how refraction takes place, compare regular and diffused reflection.
Vocabulary
- Refraction: The bending of light as it passes from one medium to another.
- Angle of incidence: The angle between the incident ray and the normal line.
- Angle of refraction: The angle between the refracted ray and the normal line.
- Diffused: Light reflected in many directions from a rough surface.
- Regular: Light reflected in a single direction from a smooth surface.
Starter Activity
- Discuss the differences between two images depicting light reflection on different surfaces.
Regular Reflection
- Light bounces off a smooth surface in a uniform/single direction.
- Examples include mirrors, polished metals, calm water, CDs, and DVDs.
Diffused Reflection
- Light bounces off a rough surface in many directions.
- Examples include walls, wood, irregular objects (bags, books, paper, people, etc.).
Day 2 - Light Refraction
- Objectives: Draw and label a refraction diagram, define denser and rarer mediums, explain how light travels from a rarer medium to a denser medium (and vice versa), compare and contrast denser and rarer mediums.
Vocabulary
- Rarer media: Mediums that allow light to travel faster, where particles are further apart.
- Denser media: Mediums that allow light to travel slower, where particles are closer together.
Previous Knowledge:
- Light travels at different speeds in different materials. Solid > Liquid > Gas > Vacuum.
Which is Denser/Thicker?
- Glass is optically denser than air. Light travels slower in glass.
Checking Understanding
- Describe light refraction observed in the classroom. Analyze speed, bending, and the denser/rarer mediums involved.
When Light Travels From:
- Optically rare to optically denser: Light slows down and bends TOWARDS the normal.
- Optically denser to optically rarer: Light speeds up and bends AWAY from the normal.
Think Pair Share - Check Your Understanding
- Choose the correct sketch demonstrating interface, normal line, incident ray, and reflected rays.
Group Work - Practice Drawing (Peer Evaluation)
- Draw reflected light in diagrams.
- Exchange papers with another group.
- Evaluate each other's work using provided answer keys.
- Post work on the bulletin board.
Compare Denser and Rarer Media
- Denser media: Light travels slower, particles closer.
- Rarer media: Light travels faster, particles further apart.
Activity - Quizizz
- Participate in an online quiz using the provided link.
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