Question

$\sqrt{2 + \sqrt{2(1 + \cos(4 theta) } }$
answer in terms of din and cos
a)2sin∅
b)2cos∅
c)sin∅
d)cos∅

please solve this is a book...with step by step explanation
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Answer 1

Answer:

3 types of images can be formed by mirror and only one image can be formed by a lens.