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To understand how an optical fibre transfers light, we must first understand the concept of 'total internal reflection'. Whenever light is refracted from one medium to another, the refractive index of the...

Original energy: GPE=509.81m KE=0 Final energy: GPE=0 KE=(1/2)mv² Therefore (1/2)mv² = 50m9.81 . The m cancels and simplifying the equation we are left with v^2...

For this question we would start by making f(x)=y. As we know the laws of logs, we can say that ln(x²)=2ln(x), therefore our equation can now be written as y= 2ln(x) - 4 . From this point, we w...

20% efficiency means that 20% of the electrical energy going into the lamp is transfered to light, and 80% of the energy is lost/wasted.

To answer this question, we need to think about 3 things: interference, phase and path difference

In the experiment, we have monochromatic light (from a laser) going through two slits and then brig...