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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

It is found that all electromagnetic signals sent from $A$ towards $B$ reach point $C$ . The speed of electromagnetic signals in glass cannot be

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Answer:

Solution:

There TIR at B,

$i > i_{C}$

$∴ 45^{o} > \sin^{- 1} (\frac{1}{μ})$

$∴ 45^{o} > \sin^{- 1} (\frac{v_{g}}{c})$

$∴ \sin 45 ° > \frac{v_{g}}{C}$

$∴ v_{g} < c \times \sin 45 °$

$∴ v_{g} < 3 \times 10^{8} \times \frac{1}{\sqrt{2}}$

$∴ v_{g} < 2.14 \times 10^{8} m s^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Geometrical OpticsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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