Across
- 4. A lens that curves inwards.
- 5. A lens that bulges outwards.
- 6. A measure of how easily light passes through a material is called .... index.
- 8. The part of the eye on which an image forms.
- 9. Instrument used to measure temperature.
- 12. Rays of light that do not cross when producing this type of image.
- 14. What light does when it hits a mirror.
- 15. Energy that enables us to see.
Down
- 1. Substance that allows heat to flow.
- 2. Light is a form of energy called ....... radiation.
- 3. Heat transfer through a liquid or a gas.
- 7. Bending of light.
- 10. Rays of light do cross when forming this type of image.
- 11. Heat transfer can occur through a vacuum.
- 13. An object that releases or emits light is