Which of the following changes would give widest spaced bright fringes (maximum angle) in the diffraction pattern formed by a double slit? Check all that apply. A) Increase the wavelength of the light used. B) Increase the separation between the slits. C) Decrease the wavelength of the light used. D) Decrease the separation between the slits. A parallel beam of light from a He-Ne laser of wavelength 633 nm, falls on two very narrow slits 0.022 mm apart. (a) At what angle the 3rd bright spot (in degrees) is observed on a screen? (b) If the screen is 1.3-m away, how far (the linear vertical distance, in cm) is 3rd order bright spot from the center