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Sahay Sir > Question Answers > JEE Mains Physics 2002-2019 Solved Video Solutions > Chapter 16 - Optics > A transparent solid cylindrical rod has a refractive index of 2/3–√ .It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is:

A transparent solid cylindrical rod has a refractive index of 2/3–√ .It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is:

In figure the number of reflections it makes before emerging form the other end is close to : (refractive index of fiber is 1.31 and sin40^∘=0.64) the optical fiber is l = 2 m long and has a diameter of d=20μm. If a ray of light is incident on one end of the fiber at angle θ1=40^∘