Waves and Their Applications - Unit 1, Module L

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Questions and Answers

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?

  • 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?

  • 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?

<p>Refraction (B)</p> Signup and view all the answers

Which of the following best describes a denser medium?

<p>A medium that slows down light. (D)</p> Signup and view all the answers

What role does the angle of incidence play in the behavior of light?

<p>It influences the angle of reflection. (A)</p> Signup and view all the answers

Which statement about light traveling through a vacuum is true?

<p>Light travels faster in a vacuum than in other media. (C)</p> Signup and view all the answers

What happens in regular reflection compared to diffused reflection?

<p>Regular reflection produces sharp images while diffused reflects scattered light. (B)</p> Signup and view all the answers

What happens to light when it travels from air to glass?

<p>Light travels slower and bends towards the normal line. (B)</p> Signup and view all the answers

Which of the following statements best describes optically denser media?

<p>Light travels slower due to closer particles. (C)</p> Signup and view all the answers

Which medium is considered to be optically rarer?

<p>Air (D)</p> Signup and view all the answers

When light exits glass and enters air, what change occurs?

<p>Light bends away from the normal line. (B)</p> Signup and view all the answers

What is the primary reason light travels slower in denser materials?

<p>Particles are more densely packed together. (A)</p> Signup and view all the answers

What is the result of refraction when light moves from denser to rarer media?

<p>Light speeds up and bends away from the normal. (D)</p> Signup and view all the answers

In which of the following scenarios does light travel faster?

<p>In air compared to glass. (D)</p> Signup and view all the answers

Flashcards

Regular Reflection

Light bouncing off a smooth surface in a single, uniform direction.

Diffused Reflection

Light bouncing off a rough surface in many different directions.

Refraction

The bending of light as it passes from one medium to another.

Denser Medium

A medium where light travels slower.

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Rarer Medium

A medium where light travels faster.

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Angle of incidence

The angle between the incident ray and the normal to the surface.

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Angle of refraction

The angle between the refracted ray and the normal to the surface.

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Reflected ray

The ray of light that bounces off a surface.

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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

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

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

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

The ray of light that strikes the surface of a medium.

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Study Notes

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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