For every diagram you draw in this lab you will need to draw one or more normal
ID: 2142544 • Letter: F
Question
For every diagram you draw in this lab you will need to draw one or more normal lines. Which of the following is always true about a normal line?
In which of the following scenarios is total internal reflection possible?
I. When light travels from air into glass.
II. When light travels from glass into air.
1. I only
2. Both I and II.
3. Neither I nor II
4. II only
1.It is perpendicular to the surface of the material.2.It is perpendicular to the refracted ray.
3.It is perpendicular to the incident ray.
A material's index of refraction is a dimensionless number that relates the speed of light in a vacuum to the speed of light in that material. Crown glass has an index of refraction equal to 1.52. What is the speed of light in crown glass? 1. 4.55685*10^8
2. 4.55685*10^8 m/s
3. it depends on the angle at which the light enters the crown glass.
4.1.97232*10^8 m/s
5.1.97232*10^8
In which of the following scenarios is total internal reflection possible?
I. When light travels from air into glass.
II. When light travels from glass into air.
1. I only
2. Both I and II.
3. Neither I nor II
4. II only
Explanation / Answer
1) 1.It is perpendicular to the surface of the material.
2) refractive index n= speed of light in vaccum/ speed of light in crown glass...
n=c/v...
c=3*10^8 m/s
v=c/n=1.973*10^8 m/s
ans is 4) 1.97232*10^8 m/s
3)when light travells from denser to rarer medium....Total internal reflection takes place..
When light travels from glass into air.
ans is 4) II only
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