In an optical fibre, the refractive index of the core should be lesser than the refractive index of the cladding.

True

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False

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Solution

The correct option is B
False

Optical fibre communication works on the principle of the Total Internal Reflection.

The core should have greater refractive index than cladding for TIR to take place because TIR will happen only when light travels from denser to rarer medium.

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Q. A typical optical fibre consists of a fine core of a material of refractive index

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surrounded by a glass or plastic cladding with refractive index

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Q. A silicon optical fibre with a core diameter large enough has a core refractive index of 1.50 and a cladding refractive index 1.47. Determine
(i) the critical angle at the core cladding interface,
(ii) the numerical aperture for the fibre
(iii) the acceptance angle in air for the fibre.

Q. Assertion (A): Propagation of light through an optical fibre is due to total internal reflection taking place at the core-cladding interface.
Reason (R) : Refractive index of the material of the core of the optical fibre is greater than that of air.

Find the refractive index of the core of an optical fiber if the critical angle is $60^{\circ}$ and the refractive index of the cladding is $\sqrt{3}$ ?

Calculate the critical angle of an optical fibre without cladding if the glass has a refractive index of 1.56.

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In an optical fibre, the refractive index of the core should be lesser than the refractive index of the cladding.

The correct option is B False Optical fibre communication works on the principle of the Total Internal Reflection. The core should have greater refractive index than cladding for TIR to take place because TIR will happen only when light travels from denser to rarer medium.

The correct option is B
False

Optical fibre communication works on the principle of the Total Internal Reflection.

The core should have greater refractive index than cladding for TIR to take place because TIR will happen only when light travels from denser to rarer medium.