Lenses and Mirrors Flashcards
Virtual image
upright, -Di, +m
Real image
inverted, +Di, -m
Concave mirror
converging
Convex mirror
diverging
Concave lens
diverging
Convex lens
converging
Convex/converging lenses correct:
farsightedness
Farsightedness
hyperopia = can see far can’t see close because the focus of the lens is behind the retina (f > retina)
Concave/diverging lenses correct:
nearsightedness
Nearsightedness
myopia = can see close can’t see far because the focus of the lens is in front of the retina (f < retina)
Lenses are the _____ of mirrors
OPPOSITE
Concave/converging mirrors form ___ images
- If Do > f: real, inverted, larger, on same side as object (+Di, |-m| > 1)
- If Do < f: virtual, upright, behind mirror (-Di, |+m|)
Convex/diverging mirrors form ___ images
Virtual (behind mirror), upright, smaller (-Di, |+m| < 1)
Plane mirrors form ___ images
Virtual (behind mirror), upright, same size
The focal length of concave/converging mirrors is
+ (same side as object)
The focal length of convex/diverging mirrors is
- (opposite side/behind mirror)
The focal length of plane mirrors is
infinite
Concave/diverging lenses form ____ images
Virtual (same side as object), upright, smaller (-Di, |+m|<1)
Convex/converging lenses form ____ images
- If Do > f: real (eye side), inverted (+Di, -m) *most
- If Do < f: virtual (object side), upright (-Do, +m)
The focal length of concave/diverging lenses is
- (object side)
The focal length of convex/converging lenses is
+ (eye side)
Equation for magnification/height of images for mirrors and lenses
M = Hi / Ho = -Di / Do
*multiply for multiple lenses (glasses + eye)
Lenses in glasses always form ___ images
virtual (-Di), upright (+m)
Eye lens is
convex/converging (+f, +Di, -m, real, inverted)
