NCERT Class 7 Science Light

NCERT Class 7 Science Light. Download NCERT Chapters and Books in pdf format. Easy to print and read. Copies of these textbooks may be downloaded and used as textbooks or for reference. Refer to other chapters and books at other links (NCERT now providing you soft copies of all textbooks of all subjects from class first to twelfth online). 

15 Light

You might have seen a beam of sunlight when it enters a room through a narrow opening or a hole. You may have also seen beams of light from the headlamps of scooters, cars and engines of trains [Fig. 15.1 (a)]. Similarly, a beam of light can be seen from a torch. Some of   you may have seen a beam of searchlight from a light house or from an airport tower [Fig. 15.1 (b)].

What do these experiences suggest?


Boojho recalls an activity he performed in Class VI. In that activity he looked at a lighted candle first through a straight pipe and then through a bent pipe (Fig. 15.2). Why was Boojho not able to see the candle flame through a bent pipe? This activity showed that light travels along straight lines. How can we change the path of light? Do you know, what happens when light falls on a polished or a shiny surface?


One way to change the direction of light is to let it fall on a shiny surface. For example, a shining stainless steel plate or a shining steel spoon can change the direction of light. The surface of water can also act like a mirror and change the path of light. Have you ever seen the reflection of trees or buildings in water Any polished or a shiny surface can act as a mirror. What happens when light falls on a mirror? You have learnt in Class VI that a mirror changes the direction of light that falls on it. This change of direction by a mirror is called reflection of light. Can you recall the activity in which you got the light of a torch reflected from a mirror? Let us perform a similar activity.


1. Fill in the blanks:

(a) An image that cannot be obtained on a screen is called ____________.

(b) Image formed by a convex __________ is always virtual and smaller in size.

(c) An image formed by a __________ mirror is always of the same size as that of the object.

(d) An image which can be obtained on a screen is called a _________ image.

(e) An image formed by a concave ___________ cannot be obtained on a screen.

2. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) We can obtain an enlarged and erect image by a convex mirror. (T/F)

(b) A concave lens always form a virtual image. (T/F)

(c) We can obtain a real, enlarged and inverted image by a concave mirror. (T/F)

(d) A real image cannot be obtained on a screen. (T/F)

(e) A concave mirror always form a real image. (T/F)

3. State the characteristics of the image formed by a plane mirror.

4. Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.

5. What is a virtual image? Give one situation where a virtual image is formed.

6. State two differences between a convex and a concave lens.

7. Give one use each of a concave and a convex mirror.

8. Which type of mirror can form a real image?

9. Which type of lens forms always a virtual image?


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