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explain the term Normal Incidence and Grazing Incidence

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Normal Incidence: When a ray incident normally on a plane as shown in the below figure.
i.e

$$ \begin{array}{l}{i=r=0} \\ {\delta=180^{\circ}}\end{array} $$

             
Grazing Incidence: In case light strikes the reflecting surface tangentially as shown in the below figure.

              

 

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avinash.dongre

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