Across
- 1. An image that can be projected onto a screen
- 4. A device for bending light rays
- 5. A wave where the vibration is perpendicular to the direction of travel
- 9. Suggests that all objects orbit the Earth
- 10. A collection of planets orbiting a star
- 11. The increase in size of an image from a telescope
- 12. A device that allows objects in the sky to be magnified
- 15. The distance between a lens and a focussed image
- 16. The distance between two equal parts of a wave
- 18. A device for splitting light into its separate components
- 20. An image that can be seen but not projected onto a screen
- 21. A vibration that transfers energy but not material
Down
- 2. Maximum displacement of a wave
- 3. The Universe contains all of space
- 6. The bending of a wave as it travels from one material to another at an angle
- 7. A wave where the vibrations are in line with the direction of travel
- 8. Suggests that all objects orbit the Sun
- 13. The lens of a telescope placed closest to the eye
- 14. The lens that is pointed towards the object to be viewed
- 17. The number of waves that pass a certain point each second
- 19. A local collection of stars and planets orbiting a central point