Question

what are half period zone. find the area of second half period zone what will be the area of third half period zone​

Answer 1

What Is Half Period Zones?

According to a very famous scientist named Fresnel, the entire area of wavefront can be divided into be 'n' number of smaller regions of zones and these zones are referred to as half period zones.

Formula for area of Half Period Zone: π { pλ+λ2(2n-1)/4} = πpλ

Area of Second Half Period Time: We can find this by entering n=2 in the above formula

Area of Third Half Period Time: We can find this by entering n=3 in the above formula