In Fraunhofer diffraction experiment, L is the distance between screen and the obstacle, b is the size of obstacle and `lambda` is wavelength of incident light. The general condition for the applicability of Fraunhofer diffraction is :A. `(b^(2))/(Llambda)gtgt1`B. `(b^(2))/(Llambda)=1`C. `(b^(2))/(Llambda)ltlt1`D. `(b^(2))/(Llambda)ne1`

In Fraunhofer diffraction experiment, L is the distance between screen

1.	In Fraunhofer diffraction experiment, L is the distance between screen and the obstacle, b is the size of obstacle and `lambda` is wavelength of incident light. The general condition for the applicability of Fraunhofer diffraction is :A. `(b^(2))/(Llambda)gtgt1`B. `(b^(2))/(Llambda)=1`C. `(b^(2))/(Llambda)ltlt1`D. `(b^(2))/(Llambda)ne1`
Answer» Correct Answer - D

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Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength `6000Å`. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will beA. `3500 Å`B. `4200 Å`C. `4700 Å`D. `6000 Å`
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