(a) How is the Young’s interference pattern and intensity affected by the widt

Question

(a) How is the Young’s interference pattern and intensity affected by the width of the slits, the separation of the slit, the distance of the slits from the screen, and the wavelength of the light source? Which of these parameters is it affected by most? Explain why.

(b) How is single slit diffraction pattern and intensity affected by the width of the slit, the distance of the slit from the screen, and the wavelength of the light source? Which of these parameters affects the pattern most? Explain why.

Explanation / Answer

equation used for fringe width for both interferencepatternen and diffraction patteren are nearly same and = Y=mLR/d

where Y = fring width, m= no. of band,L=wavelength, R= distance from slit to screeen d= slit width and

Intentisty eqn is I = I0 cos^2 theta

so, with slit width, intensity and diffraction oatterens are inversly related, i.e if slit width is increased, fringe width decreases where in remaining factors are dirclty related

intensity pattern will not be effected much

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