Lens and Mirrors Flashcards
Snell’s law
n1 sin(angle 1) = n2 sin(angle 2)
n = index of refraction
n2 > n1 bend towards normal
n2 < n1 bend away from normal
f +
f = focal length
converging
f -
f = focal length
diverging
i +
image is in front of mirror
real image
*true for lens as well (image is on other side of lens)
i -
image is behind mirror
virtual image
*true for lens as well (image is on same side as light source)
equation with i,f, and o
1/f = 1/i + 1/o
convex mirror
diverging mirror
Always virtual, upright, reduced
UVR
concave mirror object at f
converging mirror
no image formed
m -
inverted
*for both lens and mirrors
m +
upright
*for both lens and mirrors
ImI < 1
reduced image
ImI > 1
enlarged image
equation for m
m = -i/o
IR UV
Inverted = Real Upright = Virtual
Focal length for mirrors
f = r/2 r = radius of curvature
concave mirror object between f and mirror
converging mirror
virtual, upright, enlarged
UVE
concave mirror object further than f from mirror
converging mirror
real, inverted, enlarged
IRE
Plane mirros
neither convergent or divergent
b/c light does not converge, always create virtual images
Law of reflection (angle 1 = angle 2)
speed of light when not in a vaccuum
n =c/v
n = index of refraction
farsighted
AKA hyperopia
converging lens
nearsighted
AKA myopia
diverging lens
real side of mirror
light reflects back so in front of mirror is real side (where real image forms)
real side of lens
light travels through lens so real side (where real image forms)is on other side of lens than where light source is
Power of lens
P = 1/f
cornea of eye
convex
converging lens
