MCQ
The phenomenon utilised in an optical fibre is
- ARefraction
- BInterference
- CPolarization
- ✓Total internal reflection
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Currents $r.m.s.$ values
(1)${x_0}\sin \omega \,t$ (i)$ x_0$
(2)${x_0}\sin \omega \,t\cos \omega \,t$ (ii)$\frac{{{x_0}}}{{\sqrt 2 }}$
(3)${x_0}\sin \omega \,t + {x_0}\cos \omega \,t$ (iii) $\frac{{{x_0}}}{{(2\sqrt 2 )}}$

(Take density of water $=1 \mathrm{~g} / \mathrm{cc}$ )