NCERT Class VII Science Solutions: Chapter 15 – Light Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

Glide to success with Doorsteptutor material for CBSE/Class-7 : get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-7.

Question 4:

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


Characteristics of the image formed by a plane mirror:

  • Virtual and erect.
  • Behind the mirror.
  • Size of image is equal to size of object.
  • Laterally inverted image (image of left side visible on right side) .
  • Distance of image behind the mirror is equal to distance of object in front of mirror.
As Showing in Image is a Result for Plane Mirror

Question 5:

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.


A, H, I, M, O, T, U, V, W and X are the letters which form same image as the letter is. These letters are laterally symmetrical.

This Image Shows Letters Are Laterally Symmetrical

Question 6:

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


The image, which cannot be obtained on a screen, is called virtual image. The images formed by plane mirror, convex mirror and concave lens are virtual.

This Diagram Shows Plane Mirror, Convex Mirror and Concave L …

Question 7:

State two differences between a convex and a concave lens.


  • A convex lens can make images which are enlarged or smaller or equal to the size of the object whereas concave lens can always make smaller image.
  • A convex lens makes both real image and virtual images whereas a concave lens always makes a virtual image.
This Diagram Shows Differences between a Convex and a Concav …

Question 8:

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


  • Concave mirror is used by dentist, solar furnace, reflector of a torch, etc.
  • Convex mirror is used in rear view mirrors.

Developed by: