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प्रश्न
In the following figure, show two rays A and B travelling from water to air. If the critical angle for water- air surface is 48°, complete the ray diagram showing the refracted rays for each. State conditions when the ray will suffer total internal reflection.
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उत्तर
The necessary conditions for total internal reflection to occur are
- Light must travel from a denser medium to a rarer medium.
- The angle of incidence must be greater than the critical angle.
In this case, the angle of incidence. ∠ i > 48°
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संबंधित प्रश्न
A ray of light travels from water to air as shown in the diagram given below :
1) Copy the diagram and complete the path of the way. Given the critical angle for water is 48°.
2) State the condition so that internal reflection occurs in the above diagram.
Calculate the speed of light in a medium whose critical angle is 30° ?
Plot a graph between
Angle of incidence versus angle of refraction.
Write any two uses of total internal reflection.
What are the examples of total internal reflection in nature?
A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Figure). When observed from the face AD, the pin shall ______.
- appear to be near A.
- appear to be near D.
- appear to be at the centre of AD.
- not be seen at all.
The critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is:
When the angle of incidence for light travelling from a denser medium to a rarer medium is greater than the critical angle, the result is:
As the angle of incidence increases for light going from a denser medium to a rarer medium, the angle of refraction:
The critical angle for crown glass, which has a refractive index of 1.52, is:
