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Ray Optics — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsRay Optics1 Mark
Question

A diverging beam of light from a point source S having divergence angle a, falls symmetrically on a glass slab as shown.  The angles of incidence of the two extreme rays are equal.  If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is

(a) Zero

(b) α

(c)  

(d) 2 
✓

Answer

(b) α

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