Ray Optics · JEE Main previous year questions

2004 2 questions

1. Q1302004 · 24 Apr 2004 · Shift 1

   A plano convex lens of refractive index $1.5$ and radius of curvature $30\mathrm{cm}$ is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens an object be placed in order to have a real image of size of the object

   1. A.$60\mathrm{cm}$
   2. B.$30\mathrm{cm}$
   3. C.$20\mathrm{cm}$
   4. D.$80\mathrm{cm}$
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   Answer: C

2. Q1422004 · 24 Apr 2004 · Shift 1

   A light ray is incident perpendicularly to one face of a $90^{\circ }$ prism and is totally internally reflected at the glass-air interface. If the angle of reflection is $45^{\circ }$, we conclude that the refractive index $n$

   1. A.$n>\frac{1}{\sqrt{2}}$
   2. B.$n>\sqrt{2}$
   3. C.$n<\frac{1}{\sqrt{2}}$
   4. D.$n<\sqrt{2}$
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   Answer: B