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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
Rays of light incident parallel to the principal axis pass through the focus after reflection from a concave mirror.
Describe an experiment to show that a light ray bends when it passes from one transparent medium into another transparent medium.
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.
What is a prism?
A lens always forms an image between the object and the lens. State three characteristics of the image.
Distinguish between real and virtual image.
Say TRUE or FALSE
The image of right hand in a plane mirror looks like a left hand
Say TRUE or FALSE
The image formed in a pinhole camera is always inverted
Say TRUE or FALSE
The image formed in a pinhole camera is always the same size as the object
Distinguish between real & virtual images.
