What is a mirage?
Asked by Topperlearning User | 21st May, 2014, 09:56: AM
Mirage is an optical illusion which occurs on a hot day on a tarred road or in deserts during summer days. A traveller will get the impression of pools of water on the road.Objects such as a tree appears to be inverted, as if the tree is on the bank of a pond of water.This is called mirage.
This is because the air near the surface of earth has high temperature and temperature decreases gradually as we move upwards. Hence the density and refractive index of air goes on increasing as we move upwards. So the ray of light from tree or other objects travel from denser medium to rarer medium and when the angle of incidence is greater than the critical angle total internal reflection takes place and an inverted image of object is obtained.
Answered by | 21st May, 2014, 11:56: AM
- the refracive index of a glass is 1.5. A sphere of this glass is immersed in water having refractive index as 4/3 .The critical angle for light rays originating within the sphere
- What is Total Internal Reflection? State two conditions which should be fulfilled for this phenomena.
- Why is it that the images formed by total internal reflection are brighter than those formed by mirrors or lenses?
- What is critical angle?
- State the uses of optical fibres.
- What will be the value of critical angle for total internal reflectionof light travelling from glass into water. Given
- Why or how does a diamond sparkle more than a transparent material like glass cut out in same shape?
- Does the phenomenon of total internal reflection take place when light travels from the rarer medium to the denser medium?
- Derive the relation between critical angle and the refractive index?
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