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प्रश्न
What is meant by the statement, ‘the critical angle for diamond is 24°’?
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उत्तर
It means that when a light ray is incident inside a diamond at an angle greater than 24°, the light will be totally internally reflected.
Or R.I of diamond is 2.14, `[because 1/(sin24^\circ) = 2.14]`
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संबंधित प्रश्न
Name two factors which affect the critical angle for a given pair of media. State how do the factors affect it.
State two conditions necessary for total internal reflection to occur.
Plot a graph between
Sine of angle of incidence versus sine of angle of refraction,
State one factor on which a critical angle for a given pair of media depends. The critical angle for the glass-air interface is 45° for the yellow light. Will it be equal to, less than or greater than 45° for (i) red light, (ii) blue light?
A ray of light is incident on a glass surface at an angle of 50° with the corresponding angle of refraction 30°. Find the value of the R.I. of glass.
Answer the following question.
Under what conditions are total internal reflection possible? Explain it with a suitable example.
Answer the following question.
Define the critical angle of incidence and obtain an expression for it.
Observe the given figure and write appropriate phenomenon of light in the box.
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.
State two differences between normal reflection and total internal reflection.
