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17. State and explain Brewster's laws. Find the Brewster angle for air to glass transmission. (R.I. of glass =  1.5) What is meant by resolving power of an optical instrument ? What will be the change of resolving power of a microscope when objective of the microscope is dipped in oil of high refractive index ? 

Dear student,

Post multiple queries is different threads so that we can help you more efficiently as due to the paucity of time we can not solve all queries.
The answer to first two parts are below,

According to Brewster's law, the maximum polarization* of a ray of light will be achieved by letting the ray of light fall on a surface of a transparent medium in such a way that the refracted ray makes an angle 90° with the reflected ray.
And we know that,

 brewster angle 
 p = tan -1 (μ)
p= 56.30o 


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