DIGITAL LESSON PLAN-Model
Prepared by
Sabarish P
DIGITAL LESSON PLAN
Subject: Science / Physics
Topic: Properties of light
Grade Level: 5-8
It is designed to take for one period of 45 minutes
Instructional Objectives
After this lesson, students should be able to:
Identify that Light rays travels in a straight line.
Understand the phenomenon of reflection of light.
Understand the angle of incidence and angle of reflection of light.
Explain the difference between angle of incidence and angle of reflection.
Know the Law of reflection.
Identify various situations in life where reflection of light occurs.
Teaching learning plan
Teaching Aids
Presentation, data book, note book etc..
Introduction
Teacher shows some pictures and asks the students to provide feedback.
(Presentation that can be used) (Link of presentation)
Activity 1
Students
are provided with the video
and they are asked to write what they observe? (Link of video)
Activity 2
Students are provided with the video and they are asked to write what they observe?
Students are asked to write their findings
Activity3
Law of reflection (animation) http://www.physicsclassroom.com/mmedia/optics/lr.gif
When a ray of light strikes a plane mirror, the light ray reflects off the mirror. Reflection involves a change in direction of the light ray. The convention used to express the direction of a light ray is to indicate the angle which the light ray makes with a normal line drawn to the surface of the mirror. The angle of incidence is the angle between this normal line and the incident ray; the angle of reflection is the angle between this normal line and the reflected ray. According to the law of reflection, the angle of incidence equals the angle of reflection. These concepts are illustrated in the animation below.
Curiosity corner
The speed of light! This is 300,000km/s in space.
Assessment
1. Consider the diagram below. Which one of the angles (A, B, C, or D) is the angle of incidence? ______ Which one of the angles is the angle of reflection? ______
Ans :Angle B is the angle of incidence (angle between the incident ray and the normal). Angle C is the angle of reflection (angle between the reflected ray and the normal).
2. A ray of light is incident towards a plane mirror at an angle of 30-degrees with the mirror surface. What will be the angle of reflection?
Ans: The angle of reflection is 60 degrees. (Note that the angle of incidence is not 30 degrees; it is 60 degrees since the angle of incidence is measured between the incident ray and the normal.)
3. Perhaps you have observed the image of the sun in the windows of distant buildings near the time that the sun is rising or setting. However, the image of the sun is not seen in the windows of distant building during midday. Use the diagram below to explain, drawing appropriate light rays on the diagram.
Ans: A ray of light drawn from the sun's position at 7 pm to the distant window reflects off the window and travel to the observer's eye. On the other hand, a ray of light drawn from the 1 pm sun position to the window will reflect and travel to the ground, never making it to the distant observer's eye.
4. A ray of light is approaching a set of three mirrors as shown in the diagram. The light ray is approaching the first mirror at an angle of 45-degrees with the mirror surface. Trace the path of the light ray as it bounces off the mirror. Continue tracing the ray until it finally exits from the mirror system. How many times will the ray reflect before it finally exits?
Ans: The light reflects twice before it finally exits the system. Draw a normal at the point of incidence to the first mirror; measure the angle of incidence (45 degrees); then draw a reflected ray at 45 degrees from the normal. Repeat the process for the second mirror.
Prepared by
Sabarish P
