What is PRE - REQUISITE for ray optics ? 

Such questions are made for enhancing self-creative skills and should be tried answering on your own. However, here are a few points that will help you in framing

your answer:

. You have to know about linear motion of light and wave nature of light.

. For proving equations in Ray optics you have to know about similarity condition of two triangles.

. You have to know that for small angles $\theta$. $\theta \simeq \sin \left(\theta \right)\simeq \tan \left(\theta \right)$

. You have to know about right angle triangle properties 

. You have to know about optical medium.

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