In YDSE set up (see fig.), the light sources executes SHM between P and Q according to the equation `x = A sin omega t`, S being the mean position. Assume `d rarr 0` and `A lt lt L`. `omega` is small enough to neglect Doppler effect. If the sources were stationary at S, intenstiy at O would be `I_(0)`
Read the paragraph carefully and answer the following questions.

The fringe width `beta` can be expressed as
A. `beta = beta_(0) sin omega t`
B. `beta = beta_(0) cos omega t`
C. `beta = beta_(0) sin 2 omega t`
D. none of these

In YDSE set up (see fig.), the light sources executes SHM between P and Q according to the equation `x = A sin omega t`, S being the mean position. Assume `d rarr 0` and `A lt lt L`. `omega` is small enough to neglect Doppler effect. If the sources were stationary at S, intenstiy at O would be `I_(0)`
Read the paragraph carefully and answer the following questions.

When the source comes toward the point Q,
A. the bright fringe will be less bright.
B. the dark fringe will no longer remain dark
C. the fringe width will increase
D. none of these

In YDSE set up (see fig.), the light sources executes SHM between P and Q according to the equation `x = A sin omega t`, S being the mean position. Assume `d rarr 0` and `A lt lt L`. `omega` is small enough to neglect Doppler effect. If the sources were stationary at S, intenstiy at O would be `I_(0)`
Read the paragraph carefully and answer the following questions.

The fractional change in intensity of the central maximum as function of time is
A. `(A sin omega t)/(L)`
B. `(2 A sin omega t)/(L)`
C. `(3 A sin omega t)/(L)`
D. `(4 A sin omega t)/(L)`