A double-slit experiment using violet light of wavelength 400 nm produces a spacing of (triangle x). what is expected spacing if red light of wavelength 600 nm used?

Question

a) 2/3 (triangle x)
b) (triangle x)
c) 1.5 (triangle x)
d) 3 (triangle x)

Answer 1

spacing is directly proportional to wavelength , spacing then is
600/400 *triangle ...reduce the fraction.

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/slits.html#c1