Posted by **Barry** on Saturday, March 17, 2012 at 11:42am.

A prism, made of glass of refractive index 1.50, has two plane faces at an angle 33 to each other. A ray of light enters the glass from one side perpendicular to that face and emerges through the other.

Part A:

As the ray enters the glass, what is its angle of incidence ?

Give your answer in degrees.

PartB:

Just before the ray emerges from the glass, what is its angle of incidence ?

Give your answer in degrees.

Part C:

If the prism is in air calculate the deviation of the ray.

Give your answer in degrees. Remember, you're being asked for the deviation angle, not the angle of refraction. The deviation angle is the difference between the incidence and refraction angles at the glass/air interface.

- Physics -
**drwls**, Saturday, March 17, 2012 at 12:54pm
Learn Snell's law and make a serious attempt on your own. We are not going to do all of these for you.

- Physics -
**Elena**, Saturday, March 17, 2012 at 2:36pm
A: an angle of incidence is zero because this is the angle between the normal to the surface and the incident ray.

B: examine the triangle formed by: the point where the ray enters the prism, the vertex of triangle (33o) and the point where the ray emerges from the prism. β = 180o - 90o - 33o=57o. This is the angle between the ray propagating in the prism and the second plane face of prism, therefore, the second angle of incidence is 33o.

C: sin r/sin i1=1.5, sin r = 1.5•sin i1=0.817,

r = 54.8o.

deviation is 57o-54.8o=2.2o

## Answer This Question

## Related Questions

- Physic please help! - Two slabs with parallel faces are made from different ...
- physics - A ray of light is incident at an angle of 20degrees to the normal on ...
- physics - A ray of light is incident at an angle of 20degrees to the normal on ...
- physics/light reflection - A light of ray is incident at an angle of 58degrees ...
- physics - A light of ray is incident at an angle of 58degrees on the plane ...
- physics - A light of ray is incident at an angle of 58degrees on the plane ...
- Physics - An aquarium filled with water has flat glass sides whose index of ...
- Physics - An aquarium filled with water has flat glass sides whose index of ...
- Physics - A ray of light enters a glass block from air at an angle of incidence...
- Physics again - The equilateral glass prism shown has an index of refraction of ...

More Related Questions