Test review stuff.

Review for test:

Law of reflection – angle in = angle out

Refraction:  what is it, why it is

Index of refraction:  n = c/v

Snell’s law:  n1 sin(theta 1) = n2 sin(theta 2)

Other equations:  v = f l

Also worth remembering:  f does NOT change during refraction, but v and l will

Remember:  normal line (perpendicular to surface of optic)

Lenses and mirrors:  convex lens and concave mirror (both have +f); concave lens and convex mirror (-f)

Lens equation:  1/f = 1/di + 1/do

Magnification:  mag = -di/do.  Also, hi/ho (height of image divided by height of object)

-mag = upside-down image; +mag = right-side up image

Absolute value of mag tells you whether image is larger ([mag] > 1) or smaller than object ([mag] < 1)

Real (+di) vs. virtual image (-di)

Critical angle and total internal reflection:  sin(critical angle) = 1/n

Questions to expect:

1.       Snell’s law (like quiz)

2.       Lens (like HW)

3.       Miscellaneous:  you’ll choose 1 or 3 (or so) 

a.       Essay covering some abstract situation or problem

b.      More mathematical/theoretical question

c.       Demonstration?

d.      Practical (where you have to DO something or look at something)

e.      ??? (mwa ha ha ha ha…..maniacal laugh)