Question

A. Short answer questions
1. If you are 1 m away from a plane mirror, how far is your image from the mirror?
2. If the mirror image of a clock is
a. 9:35
b. 2:35
C. 6:50
d. 2:25,
what time is it?
3. Why is a looking glass always a plane mirror?
4. State the uses of plane mirrors.
5. What type of mirror is used in a torch? Why?
6. Why can a convex lens burn a paper using sunlight?
7. What is refraction?
8. What is visible light spectrum?​

Answer 1

Answer:

A.

1. A person 1 m in front of mirror seems to be 2 m away from his image.

2. a) 2:25

b) 9:35

c) 5:50

d) 11:60

3. A looking glass always a plane mirror because the image formed by a plane mirror is always errect and of same size as that of object.

4. * They ate used as looking glass.

* They are used in solar cooker.

* They are also used in various scientific instruments.

5. A concave mirror is used in torch lights.

It is used because, the light rays from a source placed on the focus of a concave mirror are reflected in such a way that the reflected rays are strong, straight and parallel.

6. A convex lens burn a paper using sunlight because convex lens concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. As the heat increases, combustion will occur when the spot becomes too hot and that paper will burn.

7. The phenomenon of change in the path of light in going from one medium to another medium is called Refraction.

8. The visible light spectrum is the portion of the electro magnetic spectrum that is visible to human eye is called Visible light spectrum.