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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Physics (PH)
Optics a parallel beam of light comp....
Optics A parallel beam of light comp.... Answer is 0.001
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Ruby negi
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here is the solution dear, 0.001cm is the correct ans.. hope you will get it.. for any doubt please ask.
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Abhishek singh Best Answer
The plane where the parallel beam of light after falling on a lens converges is called focal plane of that lens. In actual practice, the grating is always followed by a lens(I have attached a diagram for explaining that). For small angle approximation sin@ = tan@ = @, where @ is the angle. also, tan@ = Perpendicular/ Base. here the base length will be equal to focal length of lens(as we always put lens very close to grating and the focal plane is far enough from lens). I am attaching the necessary diagrams followed by solution of this question. Best regards.
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read the solution atleast 2-3 times as it is conceptually rich.
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Himanshu Pandey
also focal plane!!
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Himanshu Pandey
how to solve it,main thing here Focal length is given what to do for that !!!!!
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Dhairya sharma
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see the attached.
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Ruby negi
grating element and grating spacing is same i.e e+d... don't get confuse... look this formula.. sometimes in ques, they ask to calculate width of grating.. so W=N(e+d) is width of grating... best regards.