Ray Optics · JEE Main previous year questions

2015 2 questions

1. Q512015 · 4 Apr 2015 · Shift 1

   On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam :

   1. A.bends down wards
   2. B.bends upwards
   3. C.becomes narrower
   4. D.goes horizontally without any deflection
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   Answer: B

2. Q542015 · 4 Apr 2015 · Shift 1
   
   1. A.$\theta >{\cos }^{-1}\left[\mu \sin \left(A+{\sin }^{-1}\left(\frac{1}{\mu }\right)\right)\right]$
   2. B.$\theta <{\cos }^{-1}\left[\mu \sin \left(A+{\sin }^{-1}\left(\frac{1}{\mu }\right)\right)\right]$
   3. C.$\theta >{\sin }^{-1}\left[\mu \sin \left(A-{\sin }^{-1}\left(\frac{1}{\mu }\right)\right)\right]$
   4. D.$\theta <{\sin }^{-1}\left[\mu \sin \left(A-{\sin }^{-1}\left(\frac{1}{\mu }\right)\right)\right]$
   Show answer

   Answer: C