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Light is incident normally on a diffracting grating through which the first diffraction is seen at 32^(@). In this case the second ordei diffraction will be ...... |
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Answer» `80^(@)` `d sin theta_(n)=n lambda` for first order minimum `:.d sin 32^(@)=1 xx lambda rArr lambda= d sin 32^(@)` Now, for second order minimum `d sin theta_(2)= 2xx lambda` `:. D sin theta_(2)=2xx d sin 32^(@)` `:. sin theta_(2)=2xx sin 32^(@)` `=2xx0.529` `sin theta_(2)=1.06` but the value of sin NEVER be GREATER than 1 so second order minimum cannot OCCUR. |
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