Suppose that the device studied in the previous problem can, in practice, be considered as a quarter-wave plate when the phase shift between J11 and J22 deviates by less than 1% from its nominal value...

Suppose that the device studied in the previous problem can, in practice, be considered as a quarter-wave plate when the phase shift between J₁₁
and J22 deviates by less than 1% from its nominal value of ±π/2. Calculate the relative bandwidths, Δω/ω_i, (i = 1, 2, ...), over which this tolerance is satisfied, around the nominal values ωi found in the previous problem. Discuss how these bandwidths behave, as ωi increases.