Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at plane surfaceMedium2 minPDF

PhysicsMediummultiple choice

Two plane mirrors at an angle such that a ray incident on a mirror undergoes a total deviation of $24 0^{\circ}$ after two reflections :-

Answer:

A, B, C, D

Solution:

Each reflection deviates the ray by $π - θ$ .

$24 0^{\circ} = 36 0^{\circ} - 2 θ \Rightarrow θ = 6 0^{\circ}$

$N = \frac{36 0 ^{\circ}}{6 0 ^{\circ}} - 1 = 5$ for symmetric and asymmetric positions.

At 60-degree incidence the ray hits the second mirror normally and retraces.

Hence A, B, C and D.

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

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