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thin lenses

Terms in this set (18)

for a plus lens, when real object is close
real object (diverging into lens)
virtual image (diverging out of lens)
for a plus lens, when real object is far
real object
real image (trace back) // image on LEFT side
what is happening when image vergence is zero?
image distance l' = 1/0 = +infinity
x will be very off screen and to the right
primary focal point (F) aka X
X aka F is object position that yields L' (image vergence) of 0D (object position that gives image distance of infinity)

l=f (object distance for F is primary focal length f)
finding primary focal point (plus lens)
f = 1/-F

f=primary focal length (l)
F = primary focal POINT (X)
secondary focal point (F')
image position when object vegence is zero and infinite distance for object

image distance here is secondary to focal length (f')
how to find secondary focal length
f' = 1/F
plus lens as object moves closer inwards, but stayed beyond primary focal point, still have
REAL image
for plus lens, when object inside F have
virtual image and divergent rays form
object beyond F has vergence __________- than power of lens

PLUS LENS
LESS

results in positive vergence (converging) leaving lens
real image
object inside F has vergence _______- than power of lens

PLUS LENS
result in negative vergence (diverging) leaving lens
results in virtual image
minus lens

0 vergence into lens, image at secondary focal point for lens
diverging rays leaving lens making virtual image
minus lens rule of thumb
- minus lens: all objects result in virtual image except when object inside of F
when object inside of F, converging rays leave and we have a real image
for mins lens, is change when pass over secondary focal point (F' which on left side)
no, only when crossover F (which on right side for primary lens)
plus lens real object in front of F yields
virutal image
farther than object (can be beyond on in F)
magnified
upring
plus lens: virtual object anywhere
Real image, upright, minified, inside F' (closer than object)
real object anywhere (left side of lens) minus lens
virtual image
upright
minified
inside F '
virtual object inside F plus lens
real object
magnified
upright
farther than object
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