1. PHYS 221 Recitation Kevin Ralphs Week 11

2. Quiz Question A slit of width 130 μm passes a plane wave of infrared radiation of wavelength 1020 nm to a screen which is 3.14 m away. What is the full with of the forward “bright” central maximum intensity stripe on the screen? a)1.64 cm b)3.28 cm c)4.93 cm d)6.88 cm e)17.5 cm

3. Practice Problem

4. Quiz Question Monochromatic light is normally incident on a grating that is 1 cm wide and has 10,000 slits. The first order line is deviated at a 30° angle. What is the wavelength of the incident light? a)300 nm b)400 nm c)500 nm d)600 nm e)1000 nm

5. Quiz Question A scope with a diameter of 2.0 cm is attached to a rifle and used for target practice with targets that are 300 m away. What is the smallest feature on the target that can be resolved with this telescope? Assume λ = 400 nm. Ignore the effect of the Earth’s atmosphere on the resolution. a)15 mm b)12 mm c)6.0 mm d)7.3 mm e)9.2 mm