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  • Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Q10.9 Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

Answers (1)

best_answer

Given, 

Wavelength of light \lambda =5000\AA =5000*10^{-10}m

Speed of light c=3*10^8

Now,

Wavelength and frequency will be the same when the ray is reflected.

Frequency of reflected light 

f=\frac{c}{\lambda }=\frac{3*10^{8}}{5000*10^{-10}}=6*10^{14}Hz

Hence wavelength and frequency of light is  5000*10^{-10}m and  6*10^{14}Hz respectively.

Now,

as per the law of reflection, angle of incidence i is always equal to angle of reflection r.

i=r

Now, when the reflected ray is perpendicular with incidence ray,

i+r=90

i+i=90

2i=90

i=45

Hence the angle of incidence is 45 for this condition.

Posted by

Pankaj Sanodiya

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