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प्रश्न
A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon responsible for this effect.
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उत्तर
A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. It occurs because of refraction.
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संबंधित प्रश्न
Which property of light makes a pencil cast a shadow when it is held in front of a light source?
Write all the capital letters of the alphabet which look the same in a plane mirror.
Name the phenomenon due to which a swimming pool appears less deep than it really is.
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Show the lateral displacement of the ray on the diagram.
When a ray of light travelling in glass enters into water obliquely:
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(b) it is not refracted at all
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Light travels at a lower speed in water than in air.
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Choose and write the correct option.
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Write scientific reason.
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State whether true or false. If false, correct the statement.
The angle of deviation depends on the refractive index of the glass.
What is refractive index?
The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called ______.
Noor, a young student, was trying to demonstrate some properties of light in her Science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter-paper screen to see the spots of light being cast as they emerged.
Her friend noted the following observations from this demonstration:
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- The ratio: sin of angle of incidence in the first medium to the ratio of sin of angle of refraction in the second medium, gives the refractive index of the second material with respect to the first one.
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The bending of light as it passes from one medium to another is called ______.
How do twinkling stars occur? (or) what is the cause of the twinkling of stars?
Match the following:
| Column I | Column II | ||
| 1. | r > 90 | a. | Light gazes at the surface of separation between the two modes. |
| 2. | r = 90 | b. | No refraction. |
| 3. | r < 90 | c. | Refracted ray away from the normal |
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