Across
- 3. to use a code to convert symbols into letters
- 6. the natural agent that stimulates sight and makes things visible
- 8. to send out a signal (by radio waves)
Down
- 1. when light shines on an object
- 2. a system of signals or symbols used to communication
- 4. to give off light
- 5. rays a model of light that represents the direction of light
- 7. to use a code to convert letters into symbols