Chapter Three : Light

موضوع: Chapter Three : Light السبت يناير 12, 2008 1:45 am

1- Laws of reflection of light:
1st law: angle of incidence = angle of reflection.
2nd law: the incident light ray, the reflected light ray and the normal to the reflecting surface at the point of incidence, all lie in one plane perpendicular to the reflecting surface.

2- Refraction of light rays between two media is due to the difference in light speed in the two media v1, v2.

3- Laws of refraction of light:
1st law: relative refractive index between two media :
Chapter Three : Light BR640020

2nd law " The incident light ray, the refracted light ray and the normal to the separating surface at the point of incidence, all lie in one plane normal to the separating surface."

4- The absolute refractive index : Chapter Three : Light BR640021

5- The relative refractive index =
Chapter Three : Light BR640022

6- "Snell's law":
n sinj = const
n1 sin j = n2sinq

7- The distance between two successive similar fringes (either bright or dark)
Chapter Three : Light BR-PHE12-0005

8- Light is a wave motion.

9- The critical angle Chapter Three : Light BR640025

: is the angle of incidence in denser medium, its corresponding angle of refraction in the less dense medium equal 90 o

10- a- When light is refracted to a medium n2 :
Chapter Three : Light BR640026

11- Total internal reflection takes place when : -
The angle of incidence in denser medium is greater than the critical value.

12- Mirage is a phenomenon related to total internal reflection.

13- The angle of the apex of the prism (A) is given by: A = q1 + q2:

14- The angle of deviation " Chapter Three : Light BR640113

" is given by:
Chapter Three : Light BR640028

16- In a thin prism :
Chapter Three : Light BR-PHE12-0008

17- The angular dispersion for a thin prism is Chapter Three : Light BR-PHE12-0009

18- The " dispersive power "

Chapter Three : Light BR-PHE12-0010

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