A screen is positioned symmetrically about the central maximum so that its edges are…
PHYSICS · Single correct · A Level · Physics · Waves · Waves
Problem
A screen is positioned symmetrically about the central maximum so that its edges are each 28mm from the centre. The observed fringe width is β=0.35mm. How many complete fringes (bright + dark together) are visible on the entire screen?
(a) 161
(b) 321
(c) 160
(d) 320