Diode Mirror

Can you trap light?

If you had a small box with an interior made of reflective mirrors, and a true VACUUM with no air inside, as well as a Light Emmiting diode, would it be possible to trap light indise so that it kept bouncing around?

That's an interesting question I've wondered myself. So I dont have an answer really.

I just wanted to say though that I don't agree with Barebear's answer. A blackhole does capture light since it cannot escape it's gravitational pull, but I dont think that necessarily means that it continually will bounce around inside it since other matter within the blackhole will absorb it as well.

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35W coherent laser diode

Why wouldn't this make a good current mirror?

When you build a simple current mirror, you can use two PNP BJT transistors and place equal resistors at the emitters and diode connect (wire collector to base) one of the transistors. My prof said that using NPN transistors and placing a resistor at the collector would not work well. Why is this? It looks like it would do the same thing to me.

The basic idea of a current mirror is to use one transistor to establish the reference current and then mirror that current to bias the other transistors in the circuit. Examine the following circuit
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