State Lenz's law and hence describe and explain what happens to a magnet travelling through a metal tube
Lenz's law states that the direction of current due to emf induced by a changing magnetic flux is always such that it opposes the change that induced it.
When a magnet travels through a copper tube this induces an emf and current in the tube, this in turn produces a magnetic field which opposes the direction of motion of the magnet. This means the magnet decelerates through the tube.
MC
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Derive I = nAVe
Using Fermat's Principle explain why it makes sense for light be refracted when crossing from one medium into another that has a different refractive index.
What would happen to n and Emax when a) the intensity is reduced to 1/2 I but the wavelength λ is unchanged? b) the wavelength λ is reduced but the intensity is unchanged?