An optical fibre consists of core of m1 surrounded by a cladding of m2 < m1. A beam of light enters from air at an angle a with axis of fibre. The highest a for which ray can be travelled through fibre is

\[{{\cos }^{-1}}\sqrt{\mu _{2}^{2}-\mu _{1}^{2}}\]

\[{{\sin }^{-1}}\sqrt{\mu _{1}^{2}-\mu _{2}^{2}}\]

\[{{\sec }^{-1}}\sqrt{\mu _{1}^{2}-\mu _{2}^{2}}\]

An optical fibre consists of core of m1 surrounded by a cladding of

1.	An optical fibre consists of core of m1 surrounded by a cladding of m2 < m1. A beam of light enters from air at an angle a with axis of fibre. The highest a for which ray can be travelled through fibre is
A.	\[{{\cos }^{-1}}\sqrt{\mu _{2}^{2}-\mu _{1}^{2}}\]
B.	\[{{\sin }^{-1}}\sqrt{\mu _{1}^{2}-\mu _{2}^{2}}\]
C.	30 V
D.	\[{{\sec }^{-1}}\sqrt{\mu _{1}^{2}-\mu _{2}^{2}}\]
Answer» C. 30 V

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An optical fibre consists of core of m­1 surrounded by a cladding of m2 < m1. A beam of light enters from air at an angle a with axis of fibre. The highest a for which ray can be travelled through fibre is

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An optical fibre consists of core of m1 surrounded by a cladding of m2 < m1. A beam of light enters from air at an angle a with axis of fibre. The highest a for which ray can be travelled through fibre is