Light
Date of submission: 07-1-17
6
Do the Exercise of
lesson light at the end of the chapter
Answer the following questions
1. What does a lens do?
2. What is reflection?
3. Explain the structure of the eye with the help of a neat
and labelled diagram.
4. Draw a diagram to show the reflection of light.
5. Define 1. Incident
ray 2. Angle of incidence 3.
Normal
6. IF the angle of incidence is 30 degree, what will be the
angle of reflection?
Some natural phenomena
Date of submission: 15-1-17
Do the Exercise of
some natural phenomena at the end of the chapter
1. Explain the construction and working of an electroscope
2. What is a seismograph? How does it work?
3. Explain the mechanism of earthquakes.
4. What are fault zones? Name the fault zones in India.
5. How can charging take place when substances are rubbed?
6. Write the nature of charges on a glass rod when it is
rubbed with a silk cloth.
Stars
and the solar system
Date of submission: 20-1-17
1. Observe the moon at night and sketch the shape of the
moon date wise for a fortnight
2. What is the distance of the nearest star Alpha Centauri?
3. What are celestial objects?
4. What is a light year?
5. Why does the sun appear to rise in the east and set in
the west?
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