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# Refraction

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[Front]

How long are the wavelengths of electromagnetic waves of light?
[Back]

400 nm to 700 nm

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### Questions:

35 questions
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 How long are the wavelengths of electromagnetic waves of light? 400 nm to 700 nm
 Is water denser or rare to glass? Rarer
 Rarer to denser? Towards the normal
 Denser to rarer? Away from the normal
 What is the cause of refraction? Change in speed of light while crossing two transparent media
 Do frequency and phase of light change during refraction? No
 Does the wavelength and velocity of light change after refraction? Yep baybeh
 Who was the scientist who put forth the 2nd law of refraction? W. Snell
 What is free space? Vacuum
 Ratio of speed of light in vacuum to speed of light in a giver medium? Refractive index/ Absolute refractive index
 What is the S.I unit of refractive index? Unitless quantity
 Numerical value of refractive index is always more than one. True or False? True
 What is the refractive index of water? 1.33
 Does the frequency of light keep on changing in different media? No , it remains constant
 Which light has maximum refractive index? Violet light
 Which light has minimum refractive index? Red light
 What is relative refractive index? Ratio of speed of light in two mediums
 The light ray if reflected/refracted can never trace back it's path. True or false? False
 When can a light ray trace it's path back? When it's final path gets reversed
 What is the law for tracing back of the path of light called? Principle of reversibility of the path of light
 For a rectangular glass block, what is the relation between angle of emergence to angle of incidence? They are equal
 For a rectangular glass block, what is the direction of the emergent ray with respect to the incident ray? They are parallel
 Is the displacement between emergent ray and extended incident ray angular or lateral? Lateral bishhhhhhhhhhhhhhh
 Is lateral shift more in red light than violet light? No
 Why is lateral shift more for violet light than red light? Because refractive index of violet light is greater
 Cooler air is an optically denser of rarer medium? Optically denser medium
 Hotter air is an optically rarer or denser medium? Optically Rarer medium
 Light entering the earth suffers no refraction. True or false? False
 What refraction does light entering the earth suffer? Atmospheric refraction
 How many number of refractions take place in a prism? 2
 (Refer to fig. 4.8) Which image will be the brightest? I2
 Why will the said image be brightest? Because it goes through maximum reflection and refraction
 What happens to the images subsequently/successively from I2? They keep on getting dimmer
 In a prism, in what direction does the light ray bend? Towards the base of the prism
 What is the angle of deviation usually denoted by? Delta