A light ray is incident normally on the face AB of a right-angled prism ABC (μ= 1.50) as shown in figure (18 E9). What is the largest angle ϕ for which the light ray is totally reflected at the surface AC ?

A light ray is incident normally on the face AB of a right-angled pris

1.	A light ray is incident normally on the face AB of a right-angled prism ABC (μ= 1.50) as shown in figure (18 E9). What is the largest angle ϕ for which the light ray is totally reflected at the surface AC ?
Answer» (μ= 1.50let θc be the critical ANGLE for glasssin θc/ SIN 90= 1/xsinθc= 1/1.5=2/3θc= sin⁻¹[2/3]For TOTAL internal reflection 90° -Ф>θcθ<90°=θcθ

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A light ray is incident normally on the face AB of a right-angled prism ABC (μ= 1.50) as shown in figure (18 E9). What is the largest angle ϕ for which the light ray is totally reflected at the surface AC ?

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