PHY202 Lab 9

Early investigators (including Thomas Young) measured the thickness of wool fibers using diffraction. One early instrument used a collimated beam of 560 nm light to produce a diffraction pattern on a screen placed 30 cm from a single wool fiber. If the fiber’s diameter was 16 μm, what was the width of the central maximum on the screen?

A He–Ne laser illuminates a narrow, single slit that is 1850 nm wide. The first dark fringe is found at an angle of 20.0∘ from the central peak. 1)Determine the wavelength of the light from the laser. (Express your answer to three significant figures.)

The lens of a giant human eye is about 7.4 cm in diameter. For visible light at 643 nm what is the diffraction limit in Arden of a giant human eye

A He-Ne gas laser which produces monochromatic light of a known wavelength λ= 6.35 x 10^-7 m is used to calibrate a reflection grating in a spectroscope. The first-orderdiffraction line is found at an angle of 22° to the incident beam. How many lines per meter arethere on the grating?

Collimated laser light of wavelength 548 nm is incident on a grating with 1554 lines/mm in the Littrow configuration (not normal incidence). We want to create feedback to the laser from the grating (i.e. 'retroreflection'), in order to tune its wavelength. What angle of incidence on the grating, in degrees, is required to get feedback? [The grating rotates about an axis parallel to the grating grooves]

Helium–neon laser light (? = 632.8 nm) is sent through a 0.250-mm-wide single slit. What is the width of the central maximum on a screen 2.00 m from the slit? mm

Find the angle of the third diffraction minimum for633-nm light falling on a slit of width 20.0 μm . (b) What slitwidth would place this minimum at 85.0º ? Explicitly showhow you follow the steps in Problem-Solving Strategies forWave Optics

Young’s experiment with a single-colour source is conducted in a high school lab room. It is discovered that the 5th minimum is 12.8 cm from the central maximum.  The wavelength of light used is 450 nm, and the slits are separated by 0.30 mm.  How far away is the screen