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प्रश्न
Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the ______.
पर्याय
reflection
refraction
dispersion
total internal reflection
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उत्तर
Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the total internal reflection.
Explanation:
If the angle of incidence is larger than the critical angle, a light beam that is travelling from an optically denser to a rarer medium reflects back into the denser medium.
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संबंधित प्रश्न
The diagram below shows a point source P inside a water container. Four rays A, B, C, D starting from the source P, are shown up to the water surface.
- Show in the diagram the path of these rays after striking the water surface. The Critical Angle for the water-air surface is 48°.
- Name the phenomenon which the rays B and D exhibit.
Draw the diagram of a right-angled isosceles prism which is used to make an invented image erect.
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.
Define critical angle for a given medium.
If a light ray does not undergo, refraction at the boundary between two media, the angle of incidence is:
Which of the following is not involved in formation of a rainbow?
Write any two uses of total internal reflection.
A ray of light incident at an angle θ on a refracting face of a prism emerges from the other face normally. If the angle of the prism is 5° and the prism is made of a material of refractive index 1.5, the angle of incidence is ______.
Total internal reflection is defined as the complete reflection of light back into an optically denser medium when:
