Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

						1		2
								3
		4			5													6
												7			8
					9
	10
																		11
				12	13									14		15
16											17
18
		19									20

 Check 

Across: 1. Bending of light at boundary 3. Lens that brings rays together 5. Ray leaving a mirror 9. Point where rays come together 10. Image made smaller 12. Concave lens 15. Can be projected onto a screen 17. Image made bigger 18. Ray coming in to the mirror 19. Cannot be projected onto a screen 20. Curved mirror used for security purposes

Down: 2. Distance between principal focus and lens axis 4. Distant objects appear blurred 6. Found in many optical devices 7. Drawn to show the nature of an image of a convex lens 8. Construction line at 90 degrees 11. Image in a mirror is _______ inverted 13. Upside down 14. Type of mirror used in a satellite dish 16. Reflector