Physics 60 Optics: Double Slit Interference (14 of 25) Find Distance from Central Max to 1st Min

.
In this video I will find the distances from the central maximum to the 1st minimum and to the intensity is ½ of the central maximum.

[oneinabillion]

Hi sir, equation 2 is exactly same as equation 4 since 4Io is Icm.

[josephuyo]

sir, please why did you use that secon intensity equation instead of the first one boxed in red ink

[greenboy]

sir, can you tell me how did in 2nd problem lambda become half of the wavelength = .003m ?