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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at plane surfaceEasy2 minPYQ_2020

PhysicsEasysingle choice

Two mirrors are inclined at an angle $θ$ as shown in the diagram. Light ray is incident parallel to one of the mirrors. The ray will start retracting its path after third reflection if :

Options:

Answer:

Solution:

$α = \frac{(90 - θ)}{2}$

$α^{1} = 90 - θ = 90 - (\frac{90 - θ}{2})$

$90 - θ = 45 + \frac{θ}{2}$

$45 = \frac{3 θ}{2}$

$θ = 3 0^{\circ}$

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

⏱ 2mℹ️ Source: PYQ_2020

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