# physics

posted by .

light travels from ethanol intro crown glass. what's the brewster angle in this situation? illustrate your answer with a light ray diagram. what's the signifcance of this angle of incidence?

n1=1.36for ethanol
nR=1.52 for crown glass

tanangleB=nR/ni
=1.52/1.36
=1.12 (48.2 degrees)

the only thing that I have in the diagram is the face that both the incident and reflected rays are 48.2 degrees in the ethanol..not even sure if that is right.

not sure how to draw it or what the signicance is....please explain.

physics - bobpursley, Saturday, January 16, 2010 at 3:44pm

Bob - I looked at the website you gave me. In order to draw it, do I need to also figure out the angle of incidence and reflection? If so, how do i do that...thanks

physics - bobpursley, Saturday, January 16, 2010 at 5:25pm
WEll, you have the angles of incidence of 48.2, so use snell's law to get the angle of refracation.

okay so I did that, and have my diagram drawn now, but what is the significance? I know that the angle of incicdence, from Brewster'slaw, is 48.2 degrees, and the angle of refraction, from Snell' Law, is 41.84. However this wouldn't be total internal reflection, since its going from ethanol -->crown glass, which is lower index of refraction to higher and total internal reflection requires from higher to lower. So why is significant about this then?

• physics -

The Brewster angle and the Total Internal Reflection angles are different. When light is incident at the Brewster angle, the refracted wave and reflected waves are perpendicular.

http://en.wikipedia.org/wiki/Brewster's_angle

## Similar Questions

Two slabs with parallel faces are made from different types of glass. A ray of light travels through air and enters each slab at the same angle of incidence. Which slab has the greater index of refraction and why?

Consider the optical interface between crown glass and ethanol. Under what conditions would total internal relfection be possible at this interface?
3. ### physics

light travels from ethanol intro crown glass. what's the brewster angle in this situation?
4. ### physics

light travels from ethanol intro crown glass. what's the brewster angle in this situation?
5. ### Physics

Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of incidence of 26.50°. What is the …
6. ### physics

Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of incidence of 26.50°. What is the …
7. ### physics/light reflection

A light of ray is incident at an angle of 58degrees on the plane surface of a block of glass of refractive index 1.60. Some light is reflected on the other side of the normal at the same angle as the angle of incidence. Find: a.the …
8. ### Physics

A ray of sunlight is passing from diamond into crown glass; the angle of incidence is 36.00°. The indices of refraction for the blue and red components of the ray are: blue (ndiamond = 2.444, ncrown glass = 1.531), and red (ndiamond …
9. ### Physics

Red light (n = 1.520) and violet light (n = 1.538) traveling in air are incident on a slab of crown glass. Both colors enter the glass at the same angle of refraction. The red light has an angle of incidence of 20.97°. What is the …
10. ### Physics

A light ray traveling through air strikes a smooth, flat slab of crown glass at an angle of 30 degrees to normal. Index of refraction for crown glass is 1.66. What is the angle of refraction?

More Similar Questions