Class 8 refraction of light

A smooth shining surface, which rebounds the light back in same or in different direction, is called

• Mirror

• Incident ray

• Lens

• Idealisation

What makes objects visible ?

• the absorption of light by objects

• the reflected light from the object

• the total internal reflection taking place in an object

This shows the phenomenon known as....

• reflection
• refraction
• mirrors
• focal point

The velocity of light in vacuum is _______ m/s.

• 3x10⁸
• 3x10¹²
• 3x10⁶
• 3x10¹⁰

The formula to calculate the refractive index is

• n=cv
• n=v/c
• n=c/v
• v=nc

When does the light is refracted?

• When light travels in a straight line

• When light is bounced

• When light travels in two different mediums

• When light cannot pass through an opaque object

Diagram shows the condition of a spoon in a glass of water.

What can be observed about the spoon?

• The spoon looks bent.

• The water is clearer.

• The water level rises.

• Light is refracted.