Q.1.
How fast does light travel?
Q.2.
Imagine a candle flame. Light from the candle flame travels in which direction?
Q.3.
If you half fill a clear glass with water and place a straw in the glass, how does the straw appear when you look at it carefully?
Q.4.
There are forms of light which are invisible to the human eye. Which of these is an example?
Q.5.
Light travels slightly more slowly through air than through space. It is slowed down a little bit more by glass and which of the following?
Q.6.
Why does a green apple look green?
Q.7.
Which of these is a source of light?
Q.8.
How will a beam of light shining on a glass prism behave?
Q.9.
Visible light contains many colors. Which of the following is one of these colors?
Q.10.
A submarine's periscope allows someone on the boat to see objects that are above the water. How is this possible?