(D) The light enters face $AB$ normally,so it travels undeviated until it hits the face $AC$. The angle of incidence at face $AC$ is $45^{\circ}$.For

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(D) The light enters face $AB$ normally,so it travels undeviated until it hits the face $AC$. The angle of incidence at face $AC$ is $45^{\circ}$.For light to emerge from face $AC$,it must not undergo Total Internal Reflection $(TIR)$.Condition for no $TIR$: $\theta $\sin \theta $\Rightarrow \frac{1}{\sqrt{2}} Comparing the given refractive indices:Red: $\mu = 1.39 Green: $\mu = 1.44 > 1.414$ (Undergoes $TIR$)Blue: $\mu = 1.47 > 1.414$ (Undergoes $TIR$)Therefore,only red light will emerge from face $AC$.

Class 12 Physics Ray Optics and Optical Instruments Critical Angle and Total Internal Reflection

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$A$ beam of light consisting of red,green and blue colours is incident on a right-angled prism on face $AB$. The refractive indices of the material for the above red,green and blue colours are $1.39, 1.44$ and $1.47$ respectively. $A$ person looking on surface $AC$ of the prism will see

A
no light
B
green and blue colours
C
red and green colours
D
red colour only

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Class 12 Questions

Class 12

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Ray Optics and Optical Instruments

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Critical Angle and Total Internal Reflection

$A$ ray of light travels from a denser medium $(\mu)$ to air. The angle of incidence is denoted by $i$ and the angle of deviation by $D$. Let $C = \sin^{-1}(1/\mu)$. Which of the following graphs is correct?

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Critical angle is that angle of incidence in the denser medium for which the angle of refraction in the rarer medium is......$^o$.

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Three rays of light,namely red $(R)$,green $(G)$ and blue $(B)$ are incident on the face $PQ$ of a right-angled prism $PQR$ as shown in the figure. The refractive indices of the material of the prism for red,green and blue wavelengths are $1.27$,$1.42$ and $1.49$ respectively. The colour of the ray$(s)$ emerging out of the face $PR$ is:

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Where can the phenomenon of total internal reflection be observed?

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$A$ small bulb is placed at the bottom of a tank containing water to a depth of $80 \, cm$. What is the area of the surface of water through which light from the bulb can emerge out? The refractive index of water is $1.33$. (Consider the bulb to be a point source.)

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$A$ beam of light consisting of red,green and blue colours is incident on a right-angled prism on face $AB$. The refractive indices of the material for the above red,green and blue colours are $1.39, 1.44$ and $1.47$ respectively. $A$ person looking on surface $AC$ of the prism will see

Similar Questions

$A$ ray of light travels from a denser medium $(\mu)$ to air. The angle of incidence is denoted by $i$ and the angle of deviation by $D$. Let $C = \sin^{-1}(1/\mu)$. Which of the following graphs is correct?

Critical angle is that angle of incidence in the denser medium for which the angle of refraction in the rarer medium is......$^o$.

Where can the phenomenon of total internal reflection be observed?

$A$ small bulb is placed at the bottom of a tank containing water to a depth of $80 \, cm$. What is the area of the surface of water through which light from the bulb can emerge out? The refractive index of water is $1.33$. (Consider the bulb to be a point source.)

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