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Questions and Answers
What does the law of reflection state?
What does the law of reflection state?
What is the term for the light that bounces off a surface?
What is the term for the light that bounces off a surface?
If the angle of incidence is 30 degrees, what is the angle of reflection?
If the angle of incidence is 30 degrees, what is the angle of reflection?
How does reflection allow us to see objects?
How does reflection allow us to see objects?
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What is the path that light travels called?
What is the path that light travels called?
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What happens to light when it hits a shiny surface?
What happens to light when it hits a shiny surface?
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Which of the following is a luminous object?
Which of the following is a luminous object?
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What is the angle of reflection if the angle of incidence is 45 degrees?
What is the angle of reflection if the angle of incidence is 45 degrees?
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Which of the following statements about non-luminous objects is true?
Which of the following statements about non-luminous objects is true?
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What is the angle of incidence when light hits a mirror at an angle of reflection of 70 degrees?
What is the angle of incidence when light hits a mirror at an angle of reflection of 70 degrees?
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What sequence describes how we perceive an object in a classroom?
What sequence describes how we perceive an object in a classroom?
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In the context of the law of reflection, if the angle of incidence is defined as 50 degrees, what is true about the angle of reflection?
In the context of the law of reflection, if the angle of incidence is defined as 50 degrees, what is true about the angle of reflection?
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Which of the following statements about luminous and non-luminous objects is accurate?
Which of the following statements about luminous and non-luminous objects is accurate?
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What role does a surface, such as a mirror, play in the reflection of light?
What role does a surface, such as a mirror, play in the reflection of light?
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If a ray of light strikes a surface at an angle of 70 degrees, what can be concluded about its behavior?
If a ray of light strikes a surface at an angle of 70 degrees, what can be concluded about its behavior?
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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 - Light Reflection
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Objectives:
- Define reflection
- State the law of reflection
- Draw ray diagrams of light reflection
- Explain how reflection allows us to see objects
- Predict the angle of incidence from the angle of reflection
Keywords
- Reflection
- Incident ray
- Reflected ray
- Angle of incidence
- Angle of reflection
Starter Activity
- Use a flashlight or laser pointer and a mirror to demonstrate how light reflects off a surface. Observe how light behaves on a shiny surface.
Reflection
- Reflection is the bouncing of light off a surface.
- Luminous objects emit their own light (e.g., flame, firefly, bulb, sun, stars).
- Non-luminous objects do not emit light but reflect light from a source (e.g., ball, tree, house, cloth, moon, earth).
Luminous Objects
- Firefly
- Torch
- Bulb
- Fire
- Sun
- Stars
Non-Luminous Objects
- Ball
- Moon
- Earth
- Tree
- Cloth
- House
Direction of Light
- Light waves travel from their source in all directions.
- When a light wave hits an object, it may change direction.
- Light travels in a straight line until it hits a surface (light ray).
Group Discussion
- Light rays did not enter the eyes, so the object is not visible
How Do We See Objects?
- Light from a source (like the sun) falls on an object.
- The object reflects light in all directions.
- The reflected light reaches our eyes.
- Our brain receives the information from our eyes, allowing us to see the object.
Checking Understanding
- Describe how you can see any object in your classroom.
Law of Reflection
- When a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
Independent Activity
- Find the angle of reflection
Check Your Understanding
- Calculate angle I and angle r
Peer Assessment
- If the angle of incidence is 20 degrees, the angle of reflection is 20 degrees.
- If the angle of incidence is 45 degrees, the angle between the incident ray and the reflecting surface is 45 degrees.
Day 2- Day 4 Information
- Day 2: Parent-Teacher conference (early dismissal)
- Day 3: Assessment 2
- Day 4: Project - Identifying Waste Issues in the School. Conduct a waste audit, categorizing types of waste and recording their amounts.
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Description
This quiz covers the basics of light reflection as part of Unit 1 in the Waves and Their Applications curriculum. Students will learn about the law of reflection, ray diagrams, and practical applications involving various materials. Understanding reflection is essential for comprehending how we see objects around us.
