Waves, light and the eye Crossword

This printable crossword puzzle on the topic of Physics has 10 clues. Answers range from 3 to 11 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.

Waves carry ....................... from one place to another.
What are light waves known as?
What is the top of a wave called?
A material you can see through is called?
A material that you can't see through is called?
What is the first colour of a rainbow?
White light is made up of how many colours?
Red, green and blue are all what colours?
what is the coloured part of the eye called?
what refracts light as it enters the eye?