Question

What is the advantage of using standard incident rays in ray diagrams over, random incident rays

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Answer 1

Answer:

We take standard incident rays to draw the ray diagram because we know in which path they will go after reflection or refraction which makes it easy to draw Ray digram.

But in case of random incident rays it becomes difficult for us to find their path after reflection or refraction hence it becomes difficult to draw ray diagram

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Answer 2

Answer:

It is easy to understand the STANDARD INCIDENT RAY Diagram

Explanation:

because we know that the parallel rays will pass through focus and vice versa

If we take random rays it is difficult to draw ray diagrams