Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsReflection at plane surfaceEasy2 minPYQ_2020

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If a ray travelling in the direction $\frac{1}{2} (\hat{i} + \sqrt{3} \hat{j})$ is incident on a plane mirror, after reflection, the ray travels along the direction $\frac{1}{2} (\hat{i} - \sqrt{3} \hat{j})$ . The angle of incidence is

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Answer:

Solution:

Angle between incident ray and reflected ray

$\cos δ = \frac{(\hat{i} + \sqrt{3} \hat{j}) . (\hat{i} - \sqrt{3} \hat{j})}{2.2}$

$\cos δ = - \frac{1}{2} \Rightarrow δ = 120^{o}$

$180 - ∠ i = 120 \Rightarrow ∠ i = 60^{o}$

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

⏱ 2mℹ️ Source: PYQ_2020

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