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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:
1.
Changing position of image
3.
An arc of seven colours seen in the sky
4.
A transparent glass pyramid, bounded by four triangular surface that separates white light into a spectrum of colours
5.
Thinner in the middle
7.
Other name of Convex lens
8.
Reflecting surface is bulged out
9.
Thicker in the middle
Down:
2.
Image obtained on screen
6.
Reflecting surface is in curving
OK