I am looking for a good website. I need practice with drawing refracted rays and totally internally refracted rays. This will also include critical angles.
Please recommend any useful websites. It will be wonderfully appreciated. The exam is on Monday.
Yes. Most of the websites are information based. I have the textbook' Nelson' Physics and their is not much information on how to draw them. I have also considered the past questions and the answers are written, not demonstrated. So, at a loss really. Its very difficult because I study independently.
If it's drawing, you should know how to precisely draw any angle given the normal and the reflecting/refractive surface, knowing where the light will bend the more when refraction is concerned.
The critical angle is often required for you to work out, given the incident angle and the refractive index between the two media involved.
You could post some of your questions (one at a time) and post what you tried to do. We'll help you know whether you are correct or not, what you have to change/improve, etc.
Hm... the simplest way to do this is to have your sketch as an image (scanned, or created through paint of another graphic program you are familiar with). If you can have grids in your image, they'll greatly help. Then you upload it on the site and attach it to your posts, or you upload it on an image hosting site and post the link. If on top of that you can measure angles, it'll be awesome!
When it comes to total internal reflection and refraction then you'd do well to remember Snell's Law
- = Refractive index of the incident material (the material it's leaving)
- = Refractive index of the material it's entering
- = incident angle
- = refracted angle
The critical angle is when
For incident values above this total internal reflection occurs (and it's always the same angle as the incident so you draw a perpendicular and sketch the same angle)