Today miss tan showed a few interesting practical set up, the first was the Van de Graaff generator, didn't know that the school have 1 of it but its interesting to see it in the lab. The second was light prism where miss tan had added new shaped glass block to show total internal reflection and diverging lens. The third was diode with the oscilloscope to show the current and also how light and temperature can increase and decrease the resistance. The last is the ripple generator. These demonstrations is better than those at the Singapore science centre