Assertion (A): Propagation of light through a | vedclass

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(B) The propagation of light through an optical fibre is indeed based on the principle of total internal reflection $(TIR)$.For $TIR$ to occur,light m

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both $(A)$ and $(R)$ are true but $(R)$ is not the correct explanation of $(A)$

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(B) The propagation of light through an optical fibre is indeed based on the principle of total internal reflection $(TIR)$.For $TIR$ to occur,light must travel from a medium of higher refractive index to a medium of lower refractive index,and the angle of incidence must be greater than the critical angle.In an optical fibre,the core has a higher refractive index $(n_1)$ than the cladding $(n_2)$. The interface between the core and the cladding is where $TIR$ occurs.The reason statement mentions that the refractive index of the core is greater than that of air. While this is true,it is not the reason why $TIR$ occurs at the core-clad interface. $TIR$ occurs because the core's refractive index is greater than the cladding's refractive index.Therefore,both $(A)$ and $(R)$ are true,but $(R)$ is not the correct explanation of $(A)$.

$A$. $Pa \cdot s$	$(i)$ $[L^2 \ T^{-2} \ K^{-1}]$
$B$. $N \cdot m \cdot K^{-1}$	$(ii)$ $[M \ L \ T^{-3} \ K^{-1}]$
$C$. $J \cdot kg^{-1} \cdot K^{-1}$	$(iii)$ $[M \ L^{-1} \ T^{-1}]$
$D$. $W \cdot m^{-1} \cdot K^{-1}$	$(iv)$ $[M \ L^2 \ T^{-2} \ K^{-1}]$

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

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