Question

Define the following.
1. Source of light
2. Transparent material
3. Translucent material
4. Opaque material
5. Shadow
6. Lateral inversion

Answer 1

1. Source of light
An object that emits light is called a source of light.
Example: Sun

2. Transparent material
A material that allows light to pass through it is called transparent material.
Example: Air

3. Translucent material
A material that partially allows light to pass through it is called translucent material.
Example: Butter paper

4. Opaque material
A material that do not allow light to pass through it is called opaque material.
Example: Wood

5. Shadow
When opaque objects are placed in the path of the light, a dark portion is formed on the opposite side of the object. This dark portion is called shadow.
Example: Eclipse is a shadow formed in nature.

6. Lateral inversion
When an object is placed in front of a plane mirror, the right side of the object appears to be on the left side of the image and left side of the object appears to be on the right side of the image. This is called lateral inversion.
Example: The word AMBULANCE is written in laterally inverted text in front of the vehicle so that the person looking in the rear-view mirror may read it and give way.