A compact disc (CD) is read from the bottom by a semiconductor laser beam with a wavelength of 790 nm that passes through a plastic substrate of refractive index 1.80. When the beam encounters a pit, part of the beam is reflected from the pit and part from the flat region between the pits, so these two beams interfere with each other. What must the minimum pit depth be so that the part of the beam reflected from a pit cancels the part of the beam reflected from the flat region? (It is this cancellation that allows the player to recognize the beginning and end of a pit.)

The value is  

Explanation:

From the question we are told that  

   The wavelength of the beam is

   The refractive index is  

Generally from the condition for destructive interference  the depth  of the pit  is mathematically represented as

Here m which is the order of the fringe is zero because both beams cancel out

So

=>    

=>    

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

i already answered it by 34/s