crossword
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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Check
Across:
2.
refractive index is ............
3.
the diameter of the circular rim of the mirror
5.
father of fibre optics
Down:
1.
The ability of some organisms to make their own light is called
4.
The distance between the pole and the principal focus of the spherical mirror is called .................
OK