


ICSE /Class 10
Physics MCQ Based On Using a triangular prism to produce a visible spectrum from white light electromagnetic spectrum
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ICSE Class 10 Physics Using a triangular prism to produce a visible spectrum from white light electromagnetic spectrum
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λ=c/f=(3×〖10〗^8)/(7.5× 〖10〗^14 )=4× 〖10〗^(-7) m 1nm=〖10〗^(-9) m ∴λ=400nm. 1A=〖10〗^(-10) m ∴ λ=4000A.
Newton discovered the Visible light.
Hershell discovered the infrared waves.
As the indigo light has the lowest wavelength among given colours, so it is scattered the most.
f=c/λ=(3×〖10〗^8)/(800× 〖10〗^(-9) )=3.75×〖10〗^14 Hz.
Speed of light increases with increase in its wavelength in glass.
In glass, Red ray of light has maximum speed.
Heated metal can produce infrared radiations.
Colour's speed is maximum in a glass.
Clouds are seen white because particles of cloud are bigger than the wavelength of white light so they scatter all colour of light,

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