Homework Answers
A)Number of bright spots will increase as for constructive interference the condition is
dsinA=mW, d is slit width ,A is angle of incidence , m is order of bright fringe, W is wavelength of light , so when d increase, all other qualities remain constant except m, as m will increase to maintain the equality.
B) size of the bright spots will decrease ,
Width of central maxima is given by w= 2fW/d,
f is focal length of lense between slit and screen,
Since is d is increased then w will decrease. As width of central maxima is decreasing so width of all other maximas will also decrease
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interference and diffraction lab
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