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What is the wavelength range of visible light? What is the importance of this wavelength range?


The wavelength range of visible light is from 4 × 10-7 m to 8 × 10-7 m.

Wavelength of visible light is very small as compared to sizes of daily life objects.
The human eye can detect that part of electromagnetic spectrum which lies in the visible light range. 
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What is an optical medium? How can we classify different media on the basis of their behaviour towards light?

Which type of phenomenon (reflection or refraction) occurs when light falls on (i) a highly polished surface like a mirror and (ii) a transparent medium like glass or water?

What is meant by the optical image of an object?

What do you mean by reflection, refraction and absorption of light?

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