White coherent light `(400 nm-700 nm)` is sent through the slits of a YDSE. `d=0.5 mm`, D=50 cm. There is a hole in the screen at a point `1.0 mm` away (along the width of the fringes) from the central line.
(a) Which wavelength will be absent in the light coming from the hole?
(b) Which wavelength(s) will have a strong intensity?

Explanation

(a) 440 nm, 667 nm, (b) 50nm