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प्रश्न
State two effects caused by the refraction of light.
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उत्तर
Refraction of light can cause following two effects:
1. An object placed under water appears to be raised.
2. A stick held obliquely and partly immersed in water appears to be bent at the water surface.
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संबंधित प्रश्न
| Column I | Column II | Column III | |
| 1 | Dispersion | Long-sightedness | Twinkling of stars |
| 2 | Refraction | Splitting of white light into component colours | Convex lens |
| 3 | Hypermetropia | Change in the direction of the ray of light due to change in medium | Spectrum of seven colours |
An extended object in the form of an arrow pointing upward has been placed in front of a plane mirror. Draw a labelled ray-diagram to show the formation of its image.
State and explain the laws of reflection of light at a plane surface (like a plane mirror), With the help of a labelled ray-diagram. Mark the angles of 'incidence' and 'reflection' clearly on the diagram. If the angle of reflection is 47.5°, what will be the angle of incidence?
A man stands 10 m in front of a large plane mirror. How far must the walk before he is 5 m away from his image?
With the help of a labelled diagram, explain why a tank full of water appears less deep than it actually is.
Draw a diagram showing the refraction of a light ray from water to glass. Label on it the incident ray, the angle of incidence (/), and the angle of refraction (r)
List four characteristics of the image formed by a concave lens of focal length 20 cm when the object is placed at a distance of 40 cm from its optical centre.
Identify the wrong figure from the following.
Explain the working of a periscope.
Why does a ray of light bend when it travels from one medium to another?
Numerical problems.
The speed of light in water is 2.25 × 108 ms–1. If the speed of light in vacuum is 3 × 108 ms–1, calculate the refractive index of water.
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 ______.
A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason.
Which object use the reflection of light?
When light passes from one medium to another the ray gets bent. This property of light is called ______.
How does the light travel?
Light travels fastest in a vacuum. Why?
The ratio of the sine of the angle of incidence to the sine of ______ is constant.
