Ten questions. The result tells you which lessons you may skip.
A doorway \(1\,\text{m}\) wide lets you hear a friend round the corner, but not see her. Why?
Parallel light of wavelength \(\lambda\) falls on a slit of width \(a\). The first dark band is at the angle \(\theta\) where
A slit \(0.2\,\text{mm}\) wide is lit by light of \(500\,\text{nm}\). The screen is \(2\,\text{m}\) away. The central maximum is
A double slit has slits \(0.1\,\text{mm}\) wide and \(0.5\,\text{mm}\) apart. Which interference order is the first to be missing?
Two stars are just resolved by a telescope when
A telescope objective is \(12.2\,\text{cm}\) across. In light of \(500\,\text{nm}\), its limit of resolution is
Unpolarised light of \(10\,\text{W/m}^2\) passes one polaroid. The polaroid is turned slowly about the beam. The transmitted intensity
Unpolarised light of \(8\,\text{W/m}^2\) passes a polariser and then an analyser at \(60°\) to it. The light leaving the analyser is
Unpolarised light is reflected from glass of \(\mu = 1.5\). The reflected light is completely plane polarised at an angle of incidence of
The sky is blue because air molecules