Light - Worksheets

 CBSE Worksheet-01

Class – VII Science (Light)

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1. Bouncing back of light in the same medium is called
   (a) Refraction (b) Reflection (c) Rarefaction (d) Retardation
2. When light bounces off a surface, the surface is
   (a) Reflector (b) Opaque (c) Transparent (d) Translucent
3. A common magnifying glass is an example of
   (a) Concave mirror (b) Convex mirror (c) Convex lens (d) Concave lens
4. Shaving mirror are usually
   (a) Concave (b) Convex (c) Plane (d) Biconcave
5. Match the following

   Column A	Column B
   a. Real image	i. Image behind the mirror
   b. Virtual image	ii. Image in front of the mirror
   c. Plane mirror	iii. Side mirror in scooters
   d. Concave mirror	iv. Kaleidoscopes
   e. Convex mirror	v. Reflectors in car headlights

6. Fill in the blanks
   1. Bodies which give out their own light are called ___________.
   2. Regular reflection takes place from the ____________________ surfaces.
   3. A _______________ refers to collection of rays.
   4. ____________ mirror is used as rear view mirror in automobiles.
   5. White light is composed of seven _______________.
7. How is rainbow formed?
8. What is spectrum?
9. Write the laws of reflection?
10. Write difference between real and virtual image?

CBSE Worksheet-01
Class – VII Science (Light)
Answer key

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1. (b)
2. (a)
3. (c)
4. (c)
5. (a) – (iv), (b) – (v), (c) – (iii), (d) – (ii), (e) – (i).
6. (a) luminous bodies (b) smooth (c) beam (d) Convex (e) colours.
7. Raindrops sometimes act like tiny prisms. They can also scatter sunlight passing through them into various colours. The combined effect of thousands of raindrops located at the same angle makes a complete rainbow.
8. When white rays of light passes through a prism, it splits into seven colours. The band of seven colours obtained by splitting of white light is called spectrum.The seven colours are commonly known as VIBGYOR which stands for violet , indigo,blue,green,yellow,orange and red.
9. The two laws of reflection are :-
   1. The angle of incidence is equal to the angle of reflection.
   2. The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane.

10. Real image	Virtual image
    1. A real image can be obtained on screen.	1. A virtual image can not be obtained on screen.
    2. It is formed in front of the mirror.	2. It is formed behind the mirror.
    3. The reflected rays actually meet after reflection.	3. The reflected rays do not meet but appear to come from a point.