PROPERTIES OF LIGHT
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PROPERTIES OF LIGHT. PROPERTIES OF LIGHT. Light like all waves can be reflected at a boundary between two media. This phenomena is simply called REFLECTION Light can also be transmitted from one medium to another. This phenomena is called REFRACTION. REFLECTION OF LIGHT.

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Properties of light
PROPERTIES OF LIGHT

Light like all waves can be reflected at a boundary between two media. This phenomena is simply called

REFLECTION

Light can also be transmitted from one medium to another. This phenomena is called

REFRACTION



NORMAL LINE

SURFACE


Video
VIDEO

THIS VIDEO SHOWS HOW A BEAMS OF LIGHT ARE REFLECTED FROM A MIRROR


Diffuse and specular reflection
DIFFUSE AND SPECULAR REFLECTION

  • MOST OBJECTS WILL PRODUCE BOTH SPECULAR AND DIFFUSE REFLECTION.

  • THE RELATIVE AMOUNT OF EACH DEPENDS ON THE ANGLE FROM THE SURFACE THAT THE LIGHT IS OBSERVED.


Video1
VIDEO

YOU CAN GET BOTH SPECULAR AND DIFFUSE REFLECTION FROM A SURFACE.


Glare
GLARE

SPECULAR REFLECTION FROM A ROUGH SURFACE


Optical devices
OPTICAL DEVICES

OPTICAL DEVICES HAVE HAD A TREMENDOUS EFFECT ON THE EVOLUTION OF OUR CIVILIZATION.


Images
IMAGES

  • OPTICAL INSTRUMENTS CAN BE USED TO DIRECT THE LIGHT FROM AN OBJECT TO CREATE AN IMAGE.

  • AN IMAGE IS A LOCATION IN SPACE THAT LOOKS EXACTLY LIKE THE OBJECT, BUT ITS SIZE AND ORIENTATION MAY BE DIFFERENT.


Images1
IMAGES

  • IF THE IMAGE IS LARGER THAN THE OBJECT, IT IS SAID TO BE “MAGNIFIED”.

  • IF THE OBJECT IS SMALLER THAN THE IMAGE, IT IS SAID TO BE “DIMINISHED”.


Mirrors
MIRRORS

LIGHT RAYS CAN BE DIRECTED VIA REFLECTION TO FORM IMAGES.


Virtual images
VIRTUAL IMAGES

  • VIRTUAL IMAGES ARE FORMED BY MIRRORS THAT WE USE TO SEE OURSELVES.

  • VIRTUAL IMAGES FORMED BY THESE MIRRORS ARE LOCATED ON THE OPOSITE SIDE OF THE MIRROR.

  • SINCE NO LIGHT IS ACTUALLY AT THE IMAGE, THEY ARE CALLED VIRTUAL IMAGES.


Video2
VIDEO

  • THESE VIDEO CLIPS SHOW THE IMAGES PRODUCED WHEN LIGHT IS REFLECTED FROM A PLANE , CONVEX AND CONCAVE MIRROR.

  • ALL OF THESE IMAGES ARE VIRTUAL.


Plane mirror

virtual

image

object

d

d

PLANE MIRROR


Concave mirror

virtual

image

object

CONCAVE MIRROR


Convex mirror

virtual

image

object

CONVEX MIRROR


Real image
REAL IMAGE

IF THE IMAGE IS ON THE SAME SIDE OF THE MIRROR AS THE OBJECT, IT IS SAID TO BE “REAL” SINCE THERE WILL BE LIGHT AT ITS LOCATION.


Mirror simulations
MIRROR SIMULATIONS

SURENDRANATH HAS SIMULATIONS ON HIS CD THAT SHOW HOW IMAGES ARE FORMED BY CONVEX AND CONCAVE MIRRORS.



Refraction1
REFRACTION

The change in the direction of travel due to a change in speed of the wave.


Video3
VIDEO

A PENCIL IN A GLASS OF WATER.


Video4
VIDEO

THE DIRECTION OF TRAVEL OF A TOY CAR IS AFFECTED AS IT TRAVELS ACROSS CARPET.


Refraction2
REFRACTION

The angle of incidence or refraction is smaller in the medium in which the speed of light is slower.

This is usually a more dense medium.


Refraction simulation
REFRACTION SIMULATION

SURENDRANATH HAS SIMULATIONS ON HIS CD THAT SHOW HOW LIGHT WAVES ARE REFRACTED AS THEY TRAVEL FROM AIR INTO A DENSE MEDIUM. NOTICE THAT THE WAVES TRAVEL SLOWER IN THE MORE DENSE MATERIAL.


Refraction3
REFRACTION

I

RF

LESS DENSE

(FASTER)

RF

I

MORE DENSE

(SLOWER)




Video5
VIDEO

THIS VIDEO SHOWS HOW A LIGHT BEAM IS REFRACTED THROUGH A LARGER ANGLE AS THE ANGLE OF THEN PRISM INCREASES.


Converging lens
CONVERGING LENS

FOCAL POINT

FOCAL LENGTH


Diverging lens
DIVERGING LENS

Focal point

focal

length


Demonstration
DEMONSTRATION

Hold a lens in front of your eye. Ask the kids if your eye looks larger or smaller.

Which type lens makes your eye look larger?

Which type lens makes your eye look smaller?


Far sighted
FAR SIGHTED

  • (HYPEROPIA)

  • DISTANT OBJECTS ARE SEEN DISTINCTLY

  • THE EYE DOES NOT CONVERGE THE LIGHT ENOUGH

  • A CONVERGENT LENS IS USED TO CORRECT NEAR VISION




Near sighted
NEAR SIGHTED

  • (MYOPIA)

  • NEAR OBJECTS ARE SEEN DISTINCTLY

  • THE EYE CONVERGES THE LIGHT TOO MUCH

  • A DIVERGENT LENS IS USED TO CORRECT FAR VISION




Dispersion
DISPERSION

THE REFRACTION OF DIFFERENT WAVELENGTHS DUE TO THE FACT THAT THEY TRAVEL AT DIFFERENT SPEEDS THROUGH LIGHT MEDIA.


Rainbow
RAINBOW

SURENDRANATH HAS SIMULATIONS ON HIS CD THAT SHOW HOW LIGHT WAVES ARE REFRACTED BY RAINDROPS TO PRODUCE A RAINBOW.

DISPERSION CAUSES THE COLORS TO REFRACT AT DIFFERENT ANGLES.


Properties of light summary
PROPERTIES OF LIGHT SUMMARY

  • REFLECTION

    • DIFFUSE & SPECULAR

    • IMAGES & MIRRORS

  • REFRACTION

    • PRISMS AND LENSES

    • VISION CORRECTION

    • DISPERSION & RAINBOWS


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