Unit - 5 Light

 Unit - 5

Light

Summary

1. An object that gives light is called a light source. Sun, electric lamp, candle lamp, etc

  are sources of light.

2. An object that has its own light is called a luminous object. For example: sun, candle light, electricity

Lamps, fire, firecrackers etc. are bright objects.

3. An object that does not have its own light is called an adipta. Unseen objects by the light of others

Only visible. Such objects are not visible when they do not receive light from others.

4. Objects that allow light to pass through are called transparent. For example: air, glass etc. are transparent.

5. A material that does not allow light to pass through is called opaque. Like: stone, wood, chalk, soil

Adi is opaque.

6. The material that has the appearance of the pakash is called semi-transparent. For example: two are broken. "

7. Light is transmitted from one place to another. Light transmission is always direct

It just goes.

8. Pinhole cameras work on the principle that light travels straight through.

1. Fill in the blank

(a) The thing that gives light is called the source of light. (b) The main natural source of light is the sun. (c) An object that has its own light is called a luminous object. (d) Objects through which light easily penetrates are called transparent objects. (e) Light is transmitted along the straight path.

(a) Which is not a source of light? (A) Sun (B) Star (E) Mirror (E) Junkiri

(b) Which luminous object? (A) Glass (A) Mirror (E) Moon (E) Star

(c) Which of the following objects is transparent? (a) Glass with glass (b) Thin paper (e) Mirror glass (e) Water

(d) How is light transmitted? (A) straight (A) left (E) Crooked (E) Like lightning

3. Write the answers to the following questions: (a) What is the source of light? (b) Write the names of three sources of light. (c) What is the difference between bright and non-bright objects? (d) What is a transparent object? (e) Write the names of any three transparent objects. (f) How is a figure formed in a pinhole camera? Show from the picture. (g) How is light transmitted? (h) How can it be seen that light goes straight?

Answer 👉 

(a) A source of light is anything that emits light. (b) Three sources of light are the sun, a light bulb, and a fire. (c) A bright object is an object that emits light, while a non-bright object is an object that does not emit light. (d) A transparent object is an object that allows light to pass through it. (e) Three transparent objects are glass, water, and air. (g) Light is transmitted through waves. (h) Light can be seen to go straight by looking at the shadow of an object. The shadow will be in the opposite direction of the light source. Here are some additional information:

• The sun is the main source of light on Earth. It is a star that is made up of hydrogen and helium. The sun's energy comes from nuclear fusion, which is a process that converts hydrogen into helium.
• A light bulb is an artificial source of light. It is made up of a filament that is heated by electricity. The filament emits light when it is heated. A fire is a natural source of light. It is made up of burning material, such as wood or coal. The burning material emits light when it is heated.
• Glass is a transparent object that is made up of silicon dioxide. It is often used to make windows and mirrors. Water is a transparent object that is made up of hydrogen and oxygen. It is essential for life on Earth.
• Air is a transparent object that is made up of nitrogen, oxygen, and other gases. It is essential for life on Earth.
• Light is transmitted through waves. The waves travel through space and time.
• Light can be seen to go straight by looking at the shadow of an object. The shadow will be in the opposite direction of the light source.