This document outlines three physics experiments on light reflection. Experiment 1 examines diffuse and regular (specular) reflection using a mirror and matte paper. Experiment 2 demonstrates the laws of reflection using a mirror and graduated disk to measure angles of incidence and reflection. It shows that the angle of incidence equals the angle of reflection, and that the incident, reflected, and normal rays lie in the same plane. Experiment 3 reverses the path of light to show the reversibility of reflection - the path of light does not change if the direction of travel is reversed.
This PowerPoint is one small part of the Astronomy Topics unit from www.sciencepowerpoint.com. This unit consists of a five part 3000+ slide PowerPoint roadmap, 12 page bundled homework package, modified homework, detailed answer keys, 8 pages of unit notes for students who may require assistance, follow along worksheets, and many review games. The homework and lesson notes chronologically follow the PowerPoint slideshow. The answer keys and unit notes are great for support professionals. The activities and discussion questions in the slideshow and meaningful. The PowerPoint includes built-in instructions, visuals, and follow up questions. Also included are critical class notes (color coded red), project ideas, video links, and review games. This unit also includes four PowerPoint review games (110+ slides each with Answers), 38+ video links, lab handouts, activity sheets, rubrics, materials list, templates, guides, and much more. Also included is a 190 slide first day of school PowerPoint presentation. Teaching Duration = 5+ weeks. Areas of Focus in the Astronomy Topics Unit: The Solar System and the Sun, Order of the Planets, Our Sun, Life Cycle of a Star, Size of Stars, Solar Eclipse, Lunar Eclipse, The Inner Planets, Mercury, Venus, Earth, Moon, Craters, Tides, Phases of the Moon, Mars and Moons, Rocketry, Asteroid Belt, NEOs, The Torino Scale, The Outer Planets and Gas Giants, Jupiter / Moons, Saturn / Moons, Uranus / Moons, Neptune / Moons, Pluto's Demotion, The Kuiper Belt, Oort Cloud, Comets / Other, Beyond the Solar System, Types of Galaxies, Blackholes, Extrasolar Planets, The Big Bang, Dark Matter, Dark Energy, The Special Theory of Relativity, Hubble Space Telescope, Constellations, Spacetime and much more. If you have any questions please feel free to contact me. Thanks again and best wishes. Sincerely, Ryan Murphy M.Ed www.sciencepowerpoint@gmail.com
This PowerPoint is one small part of the Astronomy Topics unit from www.sciencepowerpoint.com. This unit consists of a five part 3000+ slide PowerPoint roadmap, 12 page bundled homework package, modified homework, detailed answer keys, 8 pages of unit notes for students who may require assistance, follow along worksheets, and many review games. The homework and lesson notes chronologically follow the PowerPoint slideshow. The answer keys and unit notes are great for support professionals. The activities and discussion questions in the slideshow and meaningful. The PowerPoint includes built-in instructions, visuals, and follow up questions. Also included are critical class notes (color coded red), project ideas, video links, and review games. This unit also includes four PowerPoint review games (110+ slides each with Answers), 38+ video links, lab handouts, activity sheets, rubrics, materials list, templates, guides, and much more. Also included is a 190 slide first day of school PowerPoint presentation. Teaching Duration = 5+ weeks. Areas of Focus in the Astronomy Topics Unit: The Solar System and the Sun, Order of the Planets, Our Sun, Life Cycle of a Star, Size of Stars, Solar Eclipse, Lunar Eclipse, The Inner Planets, Mercury, Venus, Earth, Moon, Craters, Tides, Phases of the Moon, Mars and Moons, Rocketry, Asteroid Belt, NEOs, The Torino Scale, The Outer Planets and Gas Giants, Jupiter / Moons, Saturn / Moons, Uranus / Moons, Neptune / Moons, Pluto's Demotion, The Kuiper Belt, Oort Cloud, Comets / Other, Beyond the Solar System, Types of Galaxies, Blackholes, Extrasolar Planets, The Big Bang, Dark Matter, Dark Energy, The Special Theory of Relativity, Hubble Space Telescope, Constellations, Spacetime and much more. If you have any questions please feel free to contact me. Thanks again and best wishes. Sincerely, Ryan Murphy M.Ed www.sciencepowerpoint@gmail.com
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1. Define Work
2. Express work in proper units
3. Calculate work done in simple case
4. Define Kinetic Energy
5. Express kinetic Energy in proper units
6. Solve Simple problems based on Kinetic Energy
7. Define Potential Energy
8. Define Gravitational Potential Energy
9. Solve Simple problems based on Gravitational Potential Energy
9. Describe Energy Transformation in daily life
10. Define Power
11. Distinguish between Energy and Power
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1. Page 1 of 3
Class: Grade 10 Physics Lab worksheet Mark:
Name: Subject: Reflection of light
Experiment 1
Diffuse reflection and regular reflection
Materials:
- Plane mirror
- Mat paper
- Light source (narrow beam or laser)
Procedure:
- Direct a beam of light towards a mat paper and then towards a mirror.
1.1. What do you notice? What do we call this phenomenon?
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
1.2. Can you define reflection of light?
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
1.3. What is the difference between the two surfaces of mat paper and of mirror?
…………………………………………………………………………………………………………………….…………………………………
- When the reflected rays are parallel to each other, we say the reflection is specular or regular.
Otherwise, the reflection is diffuse.
1.4. Conclude
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
2. Page 2 of 3
Experiment 2
Laws of reflection
Materials:
- Plane mirror
- Graduated disk
- Light source (narrow beam or laser)
Procedure:
- Place the plane mirror in such a way that its straight
edge coincides with the diameter of the graduated disk as
shown in the adjacent figure.
- Direct a narrow beam of light, or laser beam, towards
the center of the disk as shown in the adjacent figure.
Adjust the beam to graze the surface of the disk.
- Observe the reflected beam. It also grazes the surface of
the disk.
2.1. Measure the angle of incidence i (the angle between
the incident ray and the normal) and the angle of
reflection r (angle between the reflected ray and the
normal)
…………………………………………………………………………………………………………………….…………………………………
2.2. Compare these two angles
…………………………………………………………………………………………………………………….…………………………………
2.3. Send the incident ray perpendicularly to the mirror and observe the reflected ray. What is the
angle of incidence i and the angle of reflection r in this case? What do we call this case?
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
2.4. Change the angle of incidence several times and measure this angle and the new angle of
reflection. Record your measurements in the following table
i
r
2.5. Compare the two angles in all the above measurements
…………………………………………………………………………………………………………………….…………………………………
2.6. Knowing that the incident ray, the reflected ray graze the surface of the graduated disk, and the
normal is also on the graduated disk, can we say that they lie in one plane?
…………………………………………………………………………………………………………………….…………………………………
Mirror
Incident
ray
Reflected
ray
Normal
i r
3. Page 3 of 3
2.7. From this experiment, we can conclude two laws of reflection related to the incident ray, the
reflected ray and the normal. State these two laws:
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
Experiment 3
Reversibility of light
Materials:
Same as in experiment 2
Procedure:
Direct the incident ray at angles of incidence equal to the
angles of reflections of the table of experiment 1, and record
the corresponding angles of reflection in the following table:
i
r
3.1. What do you notice?
………………………………………………………………………………………
3.2. Does the path of light change if we reverse the direction
of travel of light?
…………………………………………………………………………………………………………………….…………………………………
3.3. Conclude.
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
…………………………………………………………………………………………………………………….…………………………………
Mirror
Reflected
ray
Incident
ray
Normal
i r
