Chp- 10 Light - Reflection And Refraction

Question 1

True or false -
We see light of wavelength ~
750nm to 400nm

Answer 1

False; The visible light has the wavelength of 700nm(Red) to 400nm

Question 2

Fill in the blank-
We see a white object because the object ______ all the wavelength while on the other hand we see blank coulour when object ______ all the wavelength colours
(Absorb/ scatter/ reflected/ refract/ disperse)

Answer 2

White colour- when all colour wavelength reflected

Black colour- Whenn all colour wavelength absorbed

Question 3

Define reflection.

Answer 3

The phenomena where the incident ray falling on the surface is sent back to the same medium is called reflection

Question 4

State the laws of reflection

Answer 4

1) the angle of incidence is equal to the angle of the reflection
2) the incident ray reflected ray and the normal all lie in same plane

Question 5

Why is mirror coated with a metal?

Answer 5

When the light hits the metal the free electrons present in it vibrate with the same frequency as that of the incident ray and dust radiate with the same frequency. Thus we find silver coating

Question 6

What are the two types of reflection

Answer 6

Specular reflection on the regular reflection is a type of situation in which a smooth surface is required
diffuse reflection or irregular reflection is a kind of reflection in which the rough surface is required and thus a blurred image is formed

Question 7

Why is mirror coated with a metal?

Answer 7

When the light hits the metal the free electrons present in it vibrate with the same frequency as that of the incident ray and dust radiate with the same frequency. Thus we find silver coating

Question 8

What are the two types of reflection

Answer 8

Specular reflection or the regular reflection is a type of reflection in which a smooth surface is required
diffuse reflection or irregular reflection is a kind of reflection in which the rough surface is required and thus a blurred image is formed