Page 101 - Viva ICSE Science 4 : E-book

E. Answer the following questions.

1. What are the properties of light?

2. What is refraction? Give an example of refraction.
3. What are transparent, translucent and opaque materials? Give examples.

4. How is a shadow formed? Why are some shadows dark and some faint?

5. What is the diff erence between luminous and non-luminous objects? Give two
examples of each.

6. What is the diff erence between natural and artifi cial sources of light? Give two

examples of each.

THINK AND ANSWER

1. When light passes through a frosted glass, does it refl ect or refract? Give reason to
justify your answer.

2. How do you think the sunlight aff ects our non-living environment?

TALK ABOUT

You must have seen a rainbow which is a colourful arc formed in an open
ground just after the rainfall. What is a rainbow, and how is it formed?
Discuss in class along with your teacher.

LINK AND LEARN

The length of a shadow is diff erent at diff erent times of the day. This is because of the motion of
earth around the sun. Find out about the types of motions of earth and discuss them in class.

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