Sorry for the late posting!
1. Consider a 550 nm laser. It hits a piece of Plexiglas (n = 1.6) at an angle of 50 degrees with respect to a normal line.
a. Find the angle of refraction (inside the Plexi).
b. Calculate the wavelength and speed inside the Plexi.
c. Find the critical angle of this Plexi.
d. If this laser hits a diffraction grating (with 750 lines/mm), what is the angle of diffraction for a first order image? (Hint: Find d first, using the method discussed in the informal lab.)
2. Consider 50 cm (focal length) lens.
a. A candle sits 70 cm in front of the lens. Find the image location.
b. Describe the image: size, up/down, real/virtual.
c. Where could you place this candle so that you get only virtual images?
d. Where could you place this candle so that you get NO image?
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