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प्रश्न
Name the factors affecting the critical angle for the pair of media.
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उत्तर
Factors affecting the critical angle are:
- Colour (or wavelength) of light: The refractive index of a transparent medium is most for violet light and least for red light; therefore, the critical angle for a pair of media is least for violet light and most for red light. Thus, the critical angle increases with increase in wavelength of light.
- Temperature: On increasing the temperature of the medium, its refractive index decreases, so the critical angle for that pair of media increases. Thus, the critical angle increases with increase in temperature
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संबंधित प्रश्न
i) Observe the given figure and answer the following questions.
a) Identify and write the natural process shown in the figure.
b) List the phenomena which are observe in this process.
c) Redraw the diagram and show above phenomena in it.
The observation made by Swarali while doing the experiment is given below. Based on these write answers to the questions:
Swarali found that the light ray travelling from the denser medium to rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction (r) went on increasing. However, after certain value of the angle of incidence the light ray is seen to return back into the denser medium.
Questions:
- What is the specific value of∠i called?
- What is the process of reflection of incident rays into denser medium called?
- Draw the diagrams of three observations made by Swarali.
Plot a graph between
Angle of incidence versus angle of reflection,
Plot a graph between
Angle of incidence versus angle of refraction.
Can light be ‘piped’ like sound in a doctor’s stethoscope?
Choose the correct option.
Select the WRONG statement.
Which of the following is not involved in formation of a rainbow?
The entire light is reflected back into the denser medium is called ______.
Which of the following is used in optical fibres?
As the angle of incidence increases for light going from a denser medium to a rarer medium, the angle of refraction:
