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.
when the object is at focus image is formed at ...........
4.
The ability of a medium to refract light is also expressed in terms of its /................... density
Down:
1.
when the object is between f and 2f imag ewill be formed ................... 2f
3.
when object is at infinity image is at .................
5.
Optical density has a definite .....................
OK