The wavelength of the given light is required.
The wavelength of the light is [tex]2\times 10^{-4}\ \text{m}[/tex]
v = Velocity of light = [tex]3\times 10^8\ \text{m/s}[/tex]
f = Frequency = [tex]1.5\times 10^{12}\ \text{Hz}[/tex]
Wavelength is given by
[tex]\lambda=\dfrac{v}{f}[/tex]
[tex]\Rightarrow \lambda=\dfrac{3\times 10^8}{1.5\times 10^{12}}[/tex]
[tex]\Rightarrow \lambda=2\times 10^{-4}\ \text{m}[/tex]
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