State the principal maximum condition for many equally spaced slits.

What is the path difference between adjacent slits separated by \(d\) at angle \(\theta\)?

Write the phase difference between adjacent slits in a multiple-slit pattern.

Why do many slits produce sharper principal maxima than two slits?

If \(N\) identical slits are exactly in phase, how does peak intensity scale with \(N\)?

Five identical slits are in phase at a principal maximum. Compare the peak intensity with one slit alone.

A four-slit pattern has all slits in phase at a maximum. What is the field amplitude compared with one slit?

What role does the single-slit diffraction envelope play in a multiple-slit pattern?

State the condition for a missing order when slit width is \(a\) and slit spacing is \(d\).

For \(d=4a\), what is the first missing principal maximum?

For \(d=3a\), list the first two missing principal maxima.

A multiple-slit setup has \(d=0.20\,\mathrm{mm}\) and \(\lambda=500\,\mathrm{nm}\). Find the first-order principal maximum angle.

Why does increasing the number of slits improve spectral sharpness?

If the slit spacing \(d\) is decreased, what happens to the angular separation of principal maxima?

What is the zero-order principal maximum?

A principal maximum occurs at \(\theta=10^\circ\) with \(d=2.0\,\mu\mathrm{m}\) and \(m=1\). Find \(\lambda\).

Why can a grating maximum be absent even though \(d\sin\theta=m\lambda\) is satisfied?

Ten slits replace five slits with the same slit spacing and width. What changes ideally at principal maxima?

Derive the principal maximum condition from adjacent-slit phase difference.

A multiple-slit pattern has \(d/a=5\). Which of the first six principal orders are missing?