Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at plane surfaceEasy2 minPYQ_2020

PhysicsEasysingle choice

A wave has velocity $u$ in medium $P$ and velocity $2 u$ in medium $Q .$ If the wave is refracted from medium $P$ to medium $Q$ at an angle of incidence $30 °,$ then the angle of refraction will be

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Answer:

Solution:

From Snell's law,

$μ_{P} \sin 30^{o} = μ_{Q} \sin r$

$\sin r = \frac{μ_{P}}{μ_{Q}} \sin 30^{o}$

as $μ \propto \frac{1}{v}$

$\sin r = \frac{2 u}{u} \frac{1}{2} = 1$

$r = 90^{o}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at plane surface

⏱ 2mℹ️ Source: PYQ_2020

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