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प्रश्न
If an object is placed at a distance of 10 cm in from of a plane mirror, how far would it be from its image?
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उत्तर
It will be 20 cm away from its image. This is because the distance of the plane mirror from the object is equal to its distance from the image.
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संबंधित प्रश्न
Where is the image when you look at something in a mirror?
What are the important differences between looking at a photograph of your face and looking at yourself in a plane mirror?
What type of reflection of light takes place from a cinema screen?
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.
If a ray of light goes form a denser medium to a rarer medium, will it bend towards the normal or away from the normal?
In which material do you think light rays travel faster-glass or air?
Explain with the help of a labelled ray diagram, why a pencil partly immersed in water appears to be bent at the water surface. State whether the bending of pencil will increase or decrease if water is replaced by another liquid which is optically more dense than water. Give reason for your answer.
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(a) is refracted towards the normal
(b) is refracted away from the normal
(c) goes along the boundary
(d) is not refracted
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(a) it is refracted towards the normal
(b) it is not refracted at all
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(d) it is refracted away from the normal
A vertical ray of light strikes the horizontal surface of some water:
What is the angle of refraction?
The depth of a pond when seen from above appears to be less.
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A small air bubble in a glass block when seen from above appears to be raised because of ______.
Define the principal focus of a concave mirror.
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Write scientific reason.
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Explain with diagrams how refraction of incident light takes place from
- rarer to denser medium
- denser to rarer medium
- normal to the surface separating the two media.
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.
A ray of light traveling in medium 1 strikes and travels into another transparent medium 2. If the speed of light is greater in medium 1, the ray will ______.
How do twinkling stars occur? (or) what is the cause of the twinkling of stars?
