Mirror and Lenses
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Mirror
Substance from which only light rays reflect without significant absorption or refraction
Three types of mirrors
Plane mirror, convex and concave
Plane mirror
Flat reflective surface (what we have in our house)
Curved mirrors
concave (convergence) and convex (divergence)
Real images
concave -convex and plane are virtual
Optics problems
I- image formed by object O- distance of object relative to mirror
Thin lens and mirrors equation
1/0 + 1/i = 1/f
Sign (pos and neg) in thin lens equation
positive i=real, in front of mirror f=Concave o= in front negative i=vitrual, behind f= Convex o=behind
Magnification equation
m=-i/o
signs of magnification
upright= positive (virtual) inverted= negative
Convex
negative image distance m=positive (image upright)
Lenses
lights can pass through, bend and refract
in lenses, convex and concave mean…
convex=converge concave=diverge
Lens maker equation
1/f=(n-1)(1/r1-1/r2)
Lens anatomy
i=positive is real and virtual f=positive is convex and negative is concave
Diopters
positive=converging negative=diverging p=1/f
Diopters
units=inverse meters (focal length must be in meters) f=r/2 -f is directly proportional to r
The eye
cornea acts as a lens • Mopia- too strong and nearsightdness • Hyperopia- farsighted