Experiment-diffraction grating

Reference no: EM13720237

Diffraction Grating

DATA TABLE:

λ of laser (nm)	L (m)	Several Δx Values (m)	Δx_avg	θ (tan ^-1 Δx_avg /L)

Part 1:

Calculations:

Convert λ, wavelength, of laser from nm to m. Remember 1 nm = 1 x 10 ^-9 m.
Average all Δx values to get one Δx_avg.
Calculate the angle θ from tan θ = Δx_avg/L.
Find sin θ.
Solve for d using n λ = d sin θ; i.e. d = n λ/sin θ.
Use d to find d^-1, i.e. how many lines there are per mm of diffraction grating.

Part 2:

λ of laser (m)	Distance to wall (m)	Measured values of n (m)	Average change in n (m)	Calculated theta
633 * 10^-9

Calculate theta: tan^-1 (average distance between dots on wall) / (distance from card to wall)

Calculate d: wavelength / sin theta

Calculate number of grooves per mm: 1/d

Calculate number of grooves on CD = (grooves /mm) (radius of CD- grooved part only)

Reference no: EM13720237

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