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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
Define the following terms :
Incident ray, Refracted ray, Angle of incidence, Angle of refraction.
Name the mirror which always forms an erect and virtual image. What is the size of the image as compared to that of the object?
What is a real image? Name the mirror which can be used to obtain the real image of an object. What should be the position of the object relative to the mirror?
Say TRUE or FALSE
The image formed in a plane mirror is upside down
A boy of height 1m 45 cm is standing in front of a long mirror at a distance of 2 m. From this information, fill up the following sentences:
- The distance between the boy and his image is ______
- The height of the image is______
- When the boy moves 1m forward, the distance between her and her image is______
The images that are obtained on a screen are called ______ and that which cannot be obtained on a screen ______.
Write the difference between real images and virtual images.
Magnification for the ______ image is always ______.
A real image is inverted and can be caught on the screen.
Distinguish between real & virtual images.
