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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
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