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NCERT Class VII Science Solutions: Chapter 15 β Light Part 2
Question 4:
State the characteristics of the image formed by a plane mirror.
Answer:
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.
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.
Answer:
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.
Question 6:
What is a virtual image? Give one situation where a virtual image is formed.
Answer:
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.
Question 7:
State two differences between a convex and a concave lens.
Answer:
- 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.
Question 8:
Give one use each of a concave and a convex mirror.
Answer:
- Concave mirror is used by dentist, solar furnace, reflector of a torch, etc.
- Convex mirror is used in rear view mirrors.