In interference of light, a point is bright if the path difference between the two beams arriving at that point is

Options

A. an integral multiple of the wavelengths
B. an odd multiple of the wavelengths
C. an odd multiple of half of the wavelengths
D. an even multiple of half of the wavelengths

Answer

A

Explanation

`(a_(1))/(a_(2))=(4)/(3), (I_("max"))/(I_("min"))= ?`
`=(a_(1))/(a_(2))=(4)/(3) :. a_(2)(3a_(1))/(4)`
Now, `(I_("max"))/(I_("min"))+((a_(1)+a_(2))^(2))/((a_(1)-a_(2))^(2))`
`((a_(1)+(3a_(1))/(4))^(2))/((a_(1)-(3a_(1))/(4))^(2)`
`=(49)/(1)`