Bài 4. Định luật phản xạ ánh sáng

TIẾT 4
ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
(THE LAW OF REFLECTION)
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
VACABULARY
Reflection : phản xạ
Image: ảnh
Incident ray: tia tới
Perpendicularly: vuông góc
Normal: đường pháp tuyến
Angle: góc

BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
I. PLANE MIRROR
The image of an object observed in mirror is called the image of an object created by a plane mirror
C1. Sheet metal smooth and flat, water surface, glass, ...
II. THE LAW OF REFLECTION
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
I. PLANE MIRROR
The image of an object observed in mirror is called the image of an object created by a plane mirror
II. THE LAW OF REFLECTION
Phenomenon of light rays coming from the mirro faces in a definite direction is called light refrection phenomenon.
1. What plane does the reflected ray lie in?
Conclusion: Reflected ray is in the same plane with………………. and……………..
incident ray
nomal
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
Conclution: Reflected ray is in the same plane with incident ray and normal.
I. PLANE MIRROR
II. THE LAW OF REFLECTION
1. What plane does the reflected ray lie in?
2. How is the direction of a reflected ray related to the direction of an incident ray?
Angle SIN= i is called angle of incident
Angle NIR= i’ is called angle of reflection
IN lie perpendicularly with the mirror surface is called normal
Conclusion: An angle of reflection is always ……….angle of incident
equals
600
450
300
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
Conclusion: Reflected ray is in the same plane with incident ray and normal.
I. PLANE MIRROR
II. THE LAW OF REFLECTION
1. What plane does the reflected ray lie in?
2. How is the direction of a reflected ray related to the direction of an incident ray?
Conclusion: An angle of reflection is always equals angle of incident
3. The law of reflection
600
450
300
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
I. PLANE MIRROR
II. THE LAW OF REFLECTION
4. Ketch a plane mirror and light ray
I
C3.
Reflected ray is in the same plane with incident ray and normal.
1. What plane does the reflected ray lie in?
2. How is the direction of a reflected ray related to the direction of an incident ray?
An angle of reflection is always equals angle of incident
3. The law of reflection
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
Reflected ray is in the same plane with incident ray and normal.
I. PLANE MIRROR
II. THE LAW OF REFLECTION
1. What plane does the reflected ray lie in?
2. How is the direction of a reflected ray related to the direction of an incident ray?
An angle of reflection is always equals angle of incident
3. The law of reflection
C4.
III. APPLICATION
4. Ketch a plane mirror and light ray
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
Reflected ray is in the same plane with incident ray and nomal.
I. PLANE MIRROR
II. THE LAW OF REFLECTION
1. What plane does the reflected ray lie in?
2. How is the direction of a reflected ray related to the direction of an incident ray?
An angle of reflection is always equals angle of incident
3. The law of reflection
C4.
a)
b)
III. APPLICATION
4. Ketch a plane mirror and light ray
BÀI 4. ĐỊNH LUẬT PHẢN XẠ ÁNH SÁNG
( THE LAW OF REFLECTION)
Memorize
The law of reflection:

A reflection ray lies in a plane containing an incident and a normal of the mirror at an incident point

The angle of reflection equals the angle of incident