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Questions and Answers
What happens to light when it reflects off a shiny surface?
What happens to light when it reflects off a shiny surface?
According to the law of reflection, what is true about the angles of incidence and reflection?
According to the law of reflection, what is true about the angles of incidence and reflection?
Which type of object emits its own light?
Which type of object emits its own light?
How does light allow us to see objects?
How does light allow us to see objects?
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If a light ray strikes a surface at an angle of 45 degrees, what will be the angle of reflection?
If a light ray strikes a surface at an angle of 45 degrees, what will be the angle of reflection?
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What term describes the path of a light wave that travels in a straight line until it hits a surface?
What term describes the path of a light wave that travels in a straight line until it hits a surface?
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Which statement is true about luminous and non-luminous objects?
Which statement is true about luminous and non-luminous objects?
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What would be the result if light hits a non-luminous object?
What would be the result if light hits a non-luminous object?
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If an object reflects light at an angle of 30 degrees, what can be said about the angle of incidence?
If an object reflects light at an angle of 30 degrees, what can be said about the angle of incidence?
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In the context of light behavior, what does the term 'angle of incident' refer to?
In the context of light behavior, what does the term 'angle of incident' refer to?
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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 light reflection.
- Observe how light behaves when hitting a shiny surface.
Reflection
- Reflection is the bouncing of light off a surface (like a mirror).
- Luminous objects emit their own light (e.g., a flame, firefly, bulb).
- Non-luminous objects do not emit light but reflect light from a source (e.g., a book, a tree).
Checking Understanding
- List some luminous and non-luminous objects.
Luminous Objects
- Firefly
- Bulb
- Torch
- 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, the light wave may change direction.
- Light travels in a straight line until it hits a surface (light ray).
Group Discussion
- Why can't an observer see light directly from a torch at a certain position?
- Light rays did not enter the observer's eyes because of the mirror’s reflection.
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, making us see the object.
Checking Understanding (Classroom Objects)
- Describe how you can see any object in your classroom.
Law of Reflection
- The angle of incidence equals the angle 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 given the angle of incidence.
Check Your Understanding
- Calculate the angle of incidence (i) and the angle of reflection (r) given an illustration.
Peer Assessment
- Calculations Example 1: If the angle of incidence is 20 degrees, the angle of reflection is 20 degrees.
- Calculations Example 2: If the angle of incidence is 45 degrees, the angle between the incident ray and the reflecting surface is 45 degrees.
Day 2-3-4
- 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
Explore the fundamentals of light reflection in this quiz based on Unit 1, Module L. Learn about the law of reflection, how to draw ray diagrams, and the importance of reflection in seeing objects. Test your understanding of angles of incidence and reflection.
