Q9 of 61 Page 63

What is the speed of light in a vacuum? Who first measured the speed of light?

the speed of light in vaccum is 3 × 108 ms-1

It was the Danish astronomer, Olaus Roemer, who, in 1676, first successfully measured the speed of light. His method was based on observations of the eclipses of the moons of Jupiter (by Jupiter)


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Copy this figure in your answer book and show the direction of the light ray after reflection


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Why does a ray of light bend when it travels from one medium to another?

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Concave mirrors are used by dentists to examine teeth. Why?

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a) Complete the diagram to show how a concave mirror forms the image of the object.

b) What is the nature of the image?