Light And Shadow - Class 5 Science - New St. Mery English School

Light is an important part of our daily life. Without light, we would not be able to see anything around us. The Sun is the main natural source of light, while bulbs, candles, and tube lights are artificial sources of light. When light falls on an object, it can pass through, get blocked, or form a shadow.

In this chapter, we will learn how shadows are formed and why they change in size and shape. We will also understand the difference between transparent, translucent, and opaque objects. Fun activities and simple examples will help us explore how light travels and how shadows are created in our surroundings.

Light And Shadow - Class 5 Science - New St. Mery English School

What is Light?

Ans:- Light is a form of energy that helps us see things.

What are sources of light?

Ans:- The things that produce their own light are called sources of light.

Ex:- bulb, sun, stars etc 

How many types of sources of light?

Ans:- There are two types of sources of light.

1- Natural sources of light

2- Artificial sources of light

What are Natural sources of light?

Ans:- Natural sources of light are things in nature that produce their own light without being made by humans.

Ex:- Sun, Stars, glow worm etc.

What are Artificial sources of light?

Ans:- The man made things that produce light are called Artificial sources of light.

Ex:- electric bulb, torch, candles etc.

Write three properties of light?

Ans:- Three properties of light are

1- Light travels in straight line. This is called rectilinear propagation of light.

2- Light travels from one place to another.

3- White light is made up of seven colours.

What is Rainbow?

Ans:- When sunlight passes through rain drops, It splits into seven colours and makes a band of seven colours. This band of seven colours are Rainbow. It forms in the sky. The seven colours of rainbow are violet, indigo, blue, green, yellow, orange, and red (VIBGYOR)

How many types of objects on the basis of amount of light they allow to pass through them?

Ans:- There are three types of objects on the basis of amount of light they allow to pass through them.

1- Transparent objects

2- Translucent objects

3- opaque objects

What are transparent objects?

Ans:- Some objects that allow light to pass through them easily are called transparent objects.

Ex:- glass, water etc.

What are translucent objects?

Ans:- Objects through which only some light can pass are called translucent objects.

Ex:- Butter paper, frosted glass, thin cloth, oiled paper

What are opaque objects?

Ans:- Some objects that do not allow light to pass through them are called opaque objects.

Ex:- wood, stone etc.

What is shadow?

Ans:- A shadow is a dark patch formed when an object blocks the path of light. It is always formed on the opposite side to the source of light.

Write three conditions that is necessary for the formation of shadow.

Ans:- The three conditions that is necessary for the formation of shadow are

1- A light source

2- An opaque object

3- A surface such as wall, floor, table top etc.

Write five properties of shadow.

Ans:- The five properties of shadow are

1- The shadow is formed when light falls on an opaque or translucent object.

2- A shadow is formed on the opposite side of the source of light.

3- Shadow do not depend on the colour of the object. It is mostly black.

4- A shadow shows only the shape of the object and not its details.

5- The size of the shadow depends on the distance between the source of light and the object.