Lenses Lenses Lenses do all the same things mirrors Lenses do all the same things mirrors do and use all the same terms and do and use all the same terms and variables. variables. The only difference between a lens The only difference between a lens and a mirror is light goes through a and a mirror is light goes through a lens, instead of being reflected. lens, instead of being reflected. real images and focal points occur on real images and focal points occur on the opposite side as a real object. the opposite side as a real object. since light can come from either side since light can come from either side there are technically 2 focal points there are technically 2 focal points (one on each side) (one on each side)

Lenses Lenses do all the same things mirrors do and use all the same terms and variables. Lenses do all the same things mirrors do and use all the same

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Ray Diagrams for lenses You could also use the same equation “1/f = 1/q + 1/p” to do it algebraically, but we won’t have to. You could also use the same equation “1/f = 1/q + 1/p” to do it algebraically, but we won’t have to. It gets tricky because of what is real (+) and virtual (-). It gets tricky because of what is real (+) and virtual (-).

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Page 1: Lenses Lenses do all the same things mirrors do and use all the same terms and variables. Lenses do all the same things mirrors do and use all the same

LensesLenses Lenses do all the same things mirrors do and Lenses do all the same things mirrors do and

use all the same terms and variables.use all the same terms and variables. The only difference between a lens and a The only difference between a lens and a

mirror is light goes through a lens, instead of mirror is light goes through a lens, instead of being reflected.being reflected.

real images and focal points occur on the real images and focal points occur on the opposite side as a real object.opposite side as a real object.

since light can come from either side there are since light can come from either side there are technically 2 focal points (one on each side)technically 2 focal points (one on each side)

Page 2: Lenses Lenses do all the same things mirrors do and use all the same terms and variables. Lenses do all the same things mirrors do and use all the same

Types of lensesTypes of lenses

Concave Lens (Diverging Lens)

(virtual) focal point

Convex Lens (converging lens)

focal point

The virtual andreal side flip for thefocal point!

Page 3: Lenses Lenses do all the same things mirrors do and use all the same terms and variables. Lenses do all the same things mirrors do and use all the same

Ray Diagrams for lenses Ray Diagrams for lenses

You could also use the same equation You could also use the same equation “1/f = 1/q + 1/p” to do it algebraically, but “1/f = 1/q + 1/p” to do it algebraically, but we won’t have to.we won’t have to.

It gets tricky because of what is real (+) and It gets tricky because of what is real (+) and virtual (-).virtual (-).

Page 4: Lenses Lenses do all the same things mirrors do and use all the same terms and variables. Lenses do all the same things mirrors do and use all the same

Rules for Ray Diagramming Rules for Ray Diagramming LensesLenses

You must draw 3 raysYou must draw 3 rays 1. parallel to a perpendicular of the lens, 1. parallel to a perpendicular of the lens,

continues through appropriate Fcontinues through appropriate F 2. through near F for convex or what 2. through near F for convex or what

would be through far F for concave (it would be through far F for concave (it won’t make it there), continues parallel to a won’t make it there), continues parallel to a perpendicular of the lensperpendicular of the lens

3. 3. Directly through the center of the lens Directly through the center of the lens and is unaffected. and is unaffected.