A glass prism ABC (refractive index 1.5), immersed in water (refractive index 4 3 ). A ray of light is incident normally one face AB . If it is totally reflected at the face AC , then

For total internal reflection at face A C s i n θ > μ w μ g ⇒ s i n θ ≥ 4 3 × 1.5 ⇒ s i n θ ≥ 8 9

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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsTIR/Prism and DispersionEasy2 minPYQ_2020

PhysicsEasysingle choice

A glass prism $ABC$ (refractive index 1.5), immersed in water (refractive index $\frac{4}{3}$ ). A ray of light is incident normally one face $AB .$ If it is totally reflected at the face $AC,$ then

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Answer:

Solution:

For total internal reflection at face $A C$

$s i n θ > \frac{μ_{w}}{μ_{g}}$

$\Rightarrow s i n θ \geq \frac{4}{3 \times 1.5}$

$\Rightarrow s i n θ \geq \frac{8}{9}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Geometrical OpticsSubtopic:TIR/Prism and Dispersion

⏱ 2mℹ️ Source: PYQ_2020

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