The Human Eye and Colourful World
Crossword
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.
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5
Check
Across:
1.
dark muscular diaphragm that controls the size of the pupil.
3.
regulates and controls the amount of light entering the eye
4.
The distance in air from the lens or mirror's principal plane to the focus
Down:
2.
lens system forms an image on a light-sensitive screen
5.
Light enters the eye through a thin membrane
OK