Using the method of images, solve the following
The Attempt at a Solution
I have very little idea on how to solve this. I looked up various methods online and none seem to be what the lecturer has used.
This is the solution he posted up, but as usual it is missing 300 steps and also seems to differ to the short answer he has given in the actual problem sheet, although I figured because of the 2 sin θ, the 2 and 4 cancel, leaving only 2 at the bottom. And ε disappears because for finding ρ (surface charge density) we multiply the E-field by ε.
However I don't understand how a 2sinθ came to be and then abruptly disappears.
Any help appreciated.