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प्रश्न
What is mirage? Give a reason for its formation?
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.
A concave mirror forms a virtual image for an object placed ...............................
State the two laws of reflection of light.
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?
A lens always forms an image between the object and the lens. State three characteristics of the image.
Figure shows a pencil placed above a mirror
- Draw its image formed by the mirror
- Show how light rays from the object are reflected at the mirror to form the image for the eye.
Draw a diagram of a pin hole camera showing the rays of light passing between the Object and its image
The image which can be obtained on a screen is called ______.
Match the following:
| 1. | Real image | a. | Diffuse reflection |
| 2. | Virtual image | b. | An optical device which produces reflection |
| 3. | Mirror | c. | Cannot be taken on screen |
| 4. | A type of light scattering | d. | Can be taken on screen |
Magnification for the ______ image is always ______.
