The transparent media A and B are separated by a plane boundary. The speed of light in the medium A is 2 × 10 8 m s - 1 and in the medium B is 2 .5 × 10 8 m s - 1 . The critical angle for which a ray of light going from A to B is totally internally reflected is

Refractive index of the medium A relative B is given by B μ A = μ A μ B = V B V A = 2.5 2 = 5 4 Since, critical angle for the light ray going from medium A to B is given by C = sin - 1 ⁡ 1 B μ A = sin - 1 ⁡ 4 5

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Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at plane surfaceEasy2 minPYQ_2020

PhysicsEasysingle choice

The transparent media $A$ and $B$ are separated by a plane boundary. The speed of light in the medium $A$ is $2 \times 10^{8} m s^{- 1}$ and in the medium $B$ is $2 .5 \times 10^{8} m s^{- 1}$ . The critical angle for which a ray of light going from $A$ to $B$ is totally internally reflected is

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Solution:

Refractive index of the medium $A$ relative $B$ is given by

$_{B} μ^{A} = \frac{μ_{A}}{μ_{B}} = \frac{V_{B}}{V_{A}} = \frac{2.5}{2} = \frac{5}{4}$

Since, critical angle for the light ray going from medium $A$ to $B$ is given by

$C = \sin^{- 1} (\frac{1}{_{B} μ^{A}}) = \sin^{- 1} (\frac{4}{5})$

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

⏱ 2mℹ️ Source: PYQ_2020

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