How are these images created? Explain your answers with relevant diagrams. [6 marks]

Still from air to water

Refractive index for air is 1, water is 1.33, diamond is 2.42, glass is 1.5.

Light - From Air to Water

This is what Mr Tan gave us via email. This practically answers the question about light - from air to water.

When the electromagnetic wave strikes the surface, the oscillating electric field forces the electrons in the molecules of the second medium to oscillate at the same frequency as the wave. The accelerating electrons behave like atomic antennas that radiate “extra” electromagnetic waves, which combine with the original wave. The net electromagnetic wave within the second medium is a superposition of the original wave plus the extra radiated waves, and it is this superposition that constitutes the refracted wave. Since the extra waves are radiated at the same frequency as the original wave, the refracted wave also has the same frequency as the original wave, but has a higher speed.

The mirror needed to observe yourself is always 1/2 your body height.

What happens when a green laser beam passes through a diamond crystal?

Please see picture.

Snells Law

Diamond Physics

Practical Lesson on 15 July 2011

Dear students,

In case you didn't attend class on the 15th July 2011 due to various reasons, here are the demonstrations and experimental results that you have missed.


Laser beam through a water sprout:

http://www.youtube.com/watch?v=oZvs2rGxtWk&feature=related

http://www.youtube.com/watch?v=IwxHNTC05ZQ&feature=related

Diamonds:

Actual Experimental Results:

C = 30 degrees

C = 60 degrees

C = 90 degrees

C = 120 degrees

C = 150 degrees