course phys 202 1.By what percent does the speed of red light exceed that of violet light in flint glass?- these two numbers can be found in a table which come out to be 1.665 (red) and 1.620 (violet). In order to find the percent we have to take the inverse of the ratio of the indices of refraction. 1.665/1.63, the ratio is around 100.30 %, so the difference is around .30% 2.width of 1st-order spectrum of white light (400 nm-750nm) at 2.3 m from a 7500 line/cm grating **** gen phy what is the width of the spectrum? -In order to find the spectrum we have to find where 400 and 750 fall on the screen. sin of theta = m * wavelength / d m=1 d= 1/7500 400= …. 1 * (4.0 * 10^-7)/1/750000 = sin theta 400= .300, theta= 17.46 degrees 750……...* (4.0 * 10^-7)/1/750000 = sin of theta 750= .563, theta= 34.24 tan=opp/adj tan34.34=1.57m tan 17.46=.72m …1.57-.72=.85 me