1. Mar 24, 2006

### ryanvoy

A block of crown glass (refractive index - 1.52) is covered by a sheet of water (refractive index - 1.33). a ray of light incident on the water with a angle of incidence of 55 degrees. find the angle that this ray makes with the normal when it emerges from the glass.........

thanks,

Regards Ryan Voy

ryanvoy@hotmail.com

2. Mar 24, 2006

### Tide

HINT: Apply Snell's Law at each of the three interfaces.

3. Mar 24, 2006

### ryanvoy

thanks i knew i had to do that but im getting a different answer to the text book,

sorry 4 the trouble

Thanks regards Ryan

ryanvoy@hotmail.com

4. Mar 24, 2006

### Curious3141

The answer should be exactly 55 degrees, and you can do this without even invoking Snell's law explicitly. As long as the sides of all the interfaces are perfectly parallel, the exit ray in the same medium has to be parallel to the incident ray in that medium.

EDIT : This is assuming that the glass is covered on only one side with water and the final ray emerges into air.

5. Mar 25, 2006

### ryanvoy

Thanks i will check Monday with the teacher, hopfully its right

Regards Ryan,

ryanvoy@hotmail.com