Waves, Optics and the Eye

Question 1

What relation is shown by Snell’s Law?

Answer 1

When the refractive index of a medium which light is passing through changes, the angle relative to the normal that the light propagates at also changes.

if n2 > n1, then angle moves to be closer to the normal (decreases)

Question 2

How do you calculate the angle for total internal reflection to occur?

Answer 2

θ_c = sin^-1(n2/n1)

Question 3

What is the power equation for a thin lens?

Answer 3

P = 1/f = 1/d_0 + 1/d_i (in diopters/m^-1)
P is positive for converging lenses and negative for diverging lenses

Question 4

What is the near point and far point?

Answer 4

Near point: closest distance where object is clearly in focus
Far point: furthest distance where object is clearly seen

Question 5

What is the (normal) near point for a human?

Answer 5

25 cm = 0.25 m

Question 6

What is the power of accomodation?

Answer 6

The variance in power of the eye between the near point and far point