SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses =...

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SEEING SEEING THROUGH A THROUGH A LENS LENS

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Transcript of SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses =...

Page 1: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

SEEING SEEING THROUGH A THROUGH A

LENSLENS

Page 2: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

We see the world through lenses.

Eye glasses = lenses. Contact lenses = lenses.

Magnifying glasses = lenses. Microscopes = lenses. Camera = lenses.

Page 3: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

What about individuals that do not need visual aids? Yes, they still see the world through lenses in their eyes. A lens!!

Page 4: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

2 TYPES Convex (Converging) Lens

Parallel light rays converge (come to a single point) after refraction through the lens.

Concave (Diverging) Lens Parallel light rays diverge (move

away from each other) after refraction from the lens.

Page 5: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONVEX LENS F = Primary Focus (2 x F = 2F)

O = Optical Centre

F’ = Secondary Focus (2 x F’ = 2F’); located on same side as incident rays

Page 6: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONVEX CHARACTERISTIC RAYS

Any incident ray passing through the Secondary Focus will…

REFRACT PARALLEL TO THE PRINCIPAL AXIS

Page 7: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONVEX CHARACTERISTIC RAYS

Any incident ray passing through the Optical Centre will…

PASS UNDEVIATED (STRAIGHT THROUGH)

Page 8: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONVEX CHARACTERISTIC RAYS

An incident ray parallel to the principal axis will…

REFRACT THROUGH THE PRIMARY FOCUS

Page 9: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONVEX CHARACTERISTIC RAYS

Any incident ray passing through 2F’ will…

REFRACT THROUGH 2F

Page 10: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

NOTE These rules only apply to THIN lenses

Refraction (Lateral displacement) would occur otherwise.

Page 11: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

ANOTHER VIEW

Page 12: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

PREDICTING IMAGES IN A CONVEX LENS

Object located beyond 2F’

Where is the image?

The object appears to come where the light originates from.

The image is also located where all the rays come together.

Page 13: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

LOST (LAST) Location: Between F & 2F

Attitude/Orientation: Inverted

Size: Smaller than object

Type: Real (Different from Mirrors)

Page 14: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONCAVE CHARACTERISTIC RAYS

Any incident ray parallel to the principal axis will…

REFRACT AS IF IT HAD PASSED THROUGH THE PRINCIPAL FOCUS

Page 15: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONCAVE CHARACTERISTIC RAYS

Any incident ray moving toward the Secondary Focus will…

REFRACT PARALLEL TO THE PRINCIPAL AXIS

Page 16: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

CONCAVE CHARACTERISTIC RAYS

Any incident ray passing through the Optical Centre will…

PASS UNDEVIATED (GO STRAIGHT THROUGH)

Page 17: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

PREDICTING IMAGES IN A CONCAVE LENS

Object located beyond 2F

Where is the image? All the refracted rays diverge!

If the rays diverge, the image is where the refracted rays appear to meet in the opposite direction!

Page 18: SEEING THROUGH A LENS. We see the world through lenses. Eye glasses = lenses. Contact lenses = lenses. Magnifying glasses = lenses. Microscopes.

LOST (LAST) Location: Same side as object

Attitude (Orientation): Upright

Size: Smaller than object

Type: Virtual (Different from Mirrors)


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