In a single slit diffraction, the intensity of secondary maxima gradually_____ [fil in the blank]

In a single slit diffraction pattern

In single slit diffraction pattern, why is intensity of secondary maximum less than the intensity of central maximum ?

In a single slit diffraction pattern intensity and width of fringes are

In a single slit diffraction, what is the condition for formation of first secondary maximum?

In a single slit diffraction pattern the angular width of a central maxima is 30^(@) . When the slit is illuminated by light of wavelength 6000Å . Then width of the slit will be approximately given as :

Width of slit in a single slit diffraction experiment such that 20 maxima of double slit interference pattern are obtained within central maxima of the diffraction pattern is ( Slit separation for double slit arrangement =2mm)