# Snells Law help

1. Apr 26, 2007

### samsungman

A certain kind of glass $$n_blue$$ = 1.650 for blue light and $$n_red$$ = 1.610 for red light. If a beam of white light (containing all colors) is incident at an angle of 30.0 degrees, what is the angle between the red and blue light inside the glass?

I use the Snell's equation:

$$n_1sin\Theta_1=n_2sin\Theta_2$$

Hmm... I got 0.22 degrees. Is that correct?

I have another simple conceptual question:

An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature triples?

I guess it is 3 times the volume... or is it 1/3 the volume?

$$PV=nRT$$

2. Apr 26, 2007

### Mentz114

Do things expand or contract when they get hot ? If you take an empty plastic bottle with the cap firmly on from a warm room and put it in the fridge, what happens ?

3. Apr 26, 2007

### samsungman

Oh yes, Volume is directly proportional to Temperature in this case, Thanks. 3 times the Volume then.

4. Apr 26, 2007

### samsungman

Can anybody confirm with me for the first question I posted? Thanks.

5. Apr 27, 2007

### hage567

I can't see how you got 0.22 degrees. Can you show what you got for theta(red) and theta(blue)?