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A light ray is travelling through a ring...

A light ray is travelling through a ring of an optical fibre which is made of four different glasses (shown below) but each part has the same geometrical thickness. Their respective refractive indices are shown. The light ray will take the maximum time in crossing the part

A

I

B

II

C

IV

D

Same in all

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The correct Answer is:
C
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AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-ASSIGNMENT (SECTION - C)
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  14. A plano-convex lens is made of refractive index 1.6. The radius of cur...

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  15. For a plane convex lens (mu= 1.5) has radius of curvature 10 cm. It i...

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