Because the bottem mirror which is set and 45 degrees the light bounces off of and goes up at exactly 90 degrees that light then bounces off the top mirror and out a hole for you to look through.
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At angle of 30 two mirrors will give nine reflected images.
It does not need to be. It can be smaller or larger.
a 90 degree, improve this answer if you need to, im fine with it....
You'll also need a protractor to construct a 220 degree angle which can then be bisected by means of a compass and a straight line to form two 110 degree angles.
Each exterior angle is 45 degrees (interior angle = 135 degrees).