Visible light has relatively short wavelengths. Therefore, when visible light passes through an open doorway there will be a lot of diffraction. O It cannot pass through door ways because it's too small. O there will be very little diffraction. O there will not be any diffraction at all.

A light beam strikes a piece of glass with an incident angle of 45.00∘. The beam contains two colors: 450.0 nm and an unknown wavelength. The index of refraction for the 450.0-nm light is 1.482. Assume the glass is surrounded by air, which has an index of refraction of 1.000. Determine the index of refraction ?u for the unknown wavelength if its refraction angle is 0.8150∘ greater than that of the 450.0 nm light. nu = ?

b) Waveplates formed from accurate thicknesses of birefringent material may be used to change the polarisation state of light. For each of the following configurations of incident light (travelling horizontally), linear polarisers and waveplates, describe the polarisation state of the transmitted light: (i) Unpolarised light incident on a linear polariser with transmission axis vertical, followed by a half-wave plate with o and e axes at ±45 degrees to the vertical. (ii) As (i) above, but the half-wave plate is replaced by a quarter-wave plate at the same orientation (iii) As (i) above, but the linear polariser is rotated with axis at 30 degrees from the vertical, then the half-wave plate. (iv) As (i) above, but the half-wave plate is rotated with o axis vertical and e axis horizontal.

Two light pulses are emitted simultaneously from a source. Both pulses travel to a detector, but one first passes through 6.30 m of ice. Determine the difference in the pulses' times of arrival at the detector.