A physics professor wants to perform a lecture demonstration of Young's double-slit experiment for her class using the 633-nm light from a He-Ne laser. Because the lecture hall is very large, the interference pattern will be projected on a wall that is 6.0 m from the slits. For easy viewing by all students in the class, the professor wants the distance between m=0 and m=1 maxima to be 35 cm. What slit separation is required in order to produce the desired interference pattern?