Tiểu học Đô thị Sài Đồng | Song ngữ Khoa 4 - Bài 6 - Lesson 2- HOW DOES LIGHT TRAVEL

Opaque objects block light and form shadows.. Presentation..[r]

Light Unit 6 Lesson 2: (Duration 35 mins)

How does light travel ?

Tick (√) light sources

Warm up

Fill in the blanks

1 The Sun and torches are l _ _ _ _ s_ _ _ _ _ _

2 A light source can p _ _ _ _ _ _ light.

3 We can see things because they r _ _ _ _ _ _ the

light.

How light travels?

Experiment:

1 Preparation:

- 1 laser led

- Some pieces of paper with a hole in the middle

2 Result:

Presentation

Light travels in straight line.

Light cannot travel in bended path.

Presentation

When light cannot go past an

object, it forms a shadow

Presentation

Opaque objects block light and

form shadows.

Presentation

Unit 6-Lesson 2: How does light travel?

1 Travel: di chuyển

2 Straight line: đường thẳng

3 Opaque: vật chắn sáng

4 Bended line: đường cong

5 Shadow: bóng

Vocabulary

Practice 1

Let’s make some shadows of animals

Practice 2

Light travels in straight line.

Summary

Opaque objects block the light

and form a shadow.