Physics 2 Weaker concepts

What is the critical angle

Derive it:
Incidence angle that leads to angle of refraction = 90^o. Plug 90^o into Snell’s law.

Only occurs in slow to fast media.

Minima and maxima for a double slit diffraction

d = distance between slits

theta = angle of diffraction

m = order of interference

Minima and maxima for a single slit diffraction

a = slit width

diffraction grating

maxima of a double slit grating

Sign Conventions for optics

s - distance from mirror

f focal length

focal point times 2 is radius of curvature
where all rays seem to converge/diverge from. When drawing the diagram, rays pass through here.

Concave v. convex

Concave - image is real, and focal point in front of mirror. Real rays converge at the focal point
Convex - image is virtual, and focal point behind the mirror. Real rays diverge from the focal point, but can be traced back to form virtual rays

Loop vs. Junction rule

Current in and out of junction is same

Voltage in and out of a loop is same

Photons

Basically light that can get absorbed and emitted from electrons. Photons are PARTICLES, light is both. Photons have light quality’s

Lens’s

Imagine as a mirror. If it would diverge (a converging lense)

what gets traced back is the path light takes.