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प्रश्न
What is mirage? Give a reason for its formation?
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उत्तर
Hot sand (Rarer medium)
MIRAGE: When it is very hot, an inverted image of a tree is seen which is ‘illusion of eye’ (gives a false impression) of water under the tree. This is called a MIRAGE.”
REASON: Sand becomes very hot during hot noon, the layers of air in contact become rarer (expand) while upper layers of air are still at comparatively low temperature and are denser medium.
When rays of light from DENSER to RARER medium (starting from tree) are bent away from normal when refracted from Rarer to Denser medium (going towards the eye) bend towards normal and a tree appears INVERTED.
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संबंधित प्रश्न
The diagram in figure shows a ray of light AO falling on a rectangular glass slab PQRS. Complete the diagram till the ray of light emerges out of the slab. Label on the diagram the incident ray, the refracted ray and the emergent ray.
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State the changes in the position, size and nature of the image when the object is brought from infinity up to the convex lens. Illustrate your answer by drawing ray diagrams.
Distinguish between real and virtual image.
The image which can be obtained on a screen is called ______.
A virtual image is ______.
The images that are obtained on a screen are called ______ and that which cannot be obtained on a screen ______.
Calculate the number of images formed by plane mirrors kept at an angle of 10° to each other.
An object is placed at a distance of 3cm from a plane mirror. The distance between the object and image is 3cm.
Describe the nature of images formed by plane mirrors.
