Diffraction & Double Slit Experiment

Diffraction

The bending of waves around the edges of barriers

Diffraction (a) the diffraction effects are greater for long

wavelength waves (b) the diffraction effects are greater for small

holes

Young's Double Slit Experiment

Double Slit Experiment

Double Slit Experiment

Double Slit Experiment

Double Slit Experiment

Constructive Interference (Bright, maxima): d sin θ = mλ

Destructive Interference (Dark, minima): d sin θ = (m + ½)λ

Sample Problem #1

Monochromatic light falling on two slits 0.016 mm apart from each other produces a 5th order fringe at an angle of 8.8 degrees. What is the

wavelength of the light used?

Sample Problem #2

A screen containing two slits 0.100 mm apart is 1.2 m from the screen. Light with a wavelength of 500 nm falls on

the slits from a distant source. Approximately how far apart are the

adjacent bright interference fringes on the screen?

Sample Problem #2

Intensity

Dispersion

Polarization

Critical Angle

MirrorsMirrors - f is + for concave, - for convex -do and di are + for real objects & images

-do and di are - for virtual objects & images

-m is + for upright images, - for inverted images

Lenses Lenses - f is + for converging, - for diverging -do and di are + for real objects & images

-do and di are - for virtual objects & images

-m is + for upright images, - for inverted images