$2.$ Discuss the small angle approximation based on the graph using these questions.

$($i$)$ What are the angles where sin $\backslash$theta can be considered as almost equal to tan $\backslash$theta $($equation$3\mathrm{.}3)?$

Equation $3\mathrm{.}3$ is sin theta $$tan theta$=$Ym $/$ L

$($ii$)$ If the screen distance, L is $4500$ nm$,$ what is the maximum value of ym for the angle, $\backslash$theta to be considered as small angle?