Thursday 11 October 2018

LIGHT SOURCE

SHARED KNOWLEDGE AND DISCUSSION WITH  SHRI JKP SIR

LIGHTReflection of LightRefraction of LightLenses

NATURE OF LIGHT• Light is a form of energy.• Light is a form of wave motion.The way in which light radiates from its sourc...
NATURE OF LIGHT• Light travels at a speed of 3 x 108m/sthrough empty space.• Light can be detected by human eye.This speed...
• Light travels in straight lines.
• Light travels in straight lines.
EXPERIMENT TO DEMONSTRATE RECTILINEAR PROPAGATIONApparatus: 3 card board screens having small holes in their centers.Candl...
LIGHT RAYS• The path along which light energy travelsis called a ray.A light ray• A bundle of light rays is a beam of ligh...

LIGHT BEAMS• 3 different types of light beams :Parallel Beam : Light rays travels from very far awayDivergent Beam : Light...

REFLECTION OF LIGHT• We can see luminous objects: as they give offlight which enters our eyes.Non-luminous objects: as t...

TERMS USED IN THESTUDY OF REFLECTION• A reflecting surfaceAny shiny (smooth) surface.E.g a plane mirrorSymbol of a plane m...
TERMS USED IN THESTUDY OF REFLECTION• The incident rayThe ray that approaches the mirror.incident ray
TERMS USED IN THESTUDY OF REFLECTION• The reflected rayThe ray that bounces off the mirror.reflected rayincident ray

TERMS USED IN THESTUDY OF REFLECTION• The point of incidenceThe point where the incident ray meets the mirror.reflected ra...
TERMS USED IN THESTUDY OF REFLECTION• The normalThe line that is perpendicular (at 90o) to the mirror.normalreflected rayi...

TERMS USED IN THESTUDY OF REFLECTION• The angle of incidence, iThe angle between the incident ray and the normal.normalref...


TERMS USED IN THESTUDY OF REFLECTION• The angle of reflection, rThe angle between the reflected ray and the normal.normalr...
LAWS OF REFLECTION

IMAGE IN A PLANE MIRROR• The image is virtual.• The image is upright.• The image formed has the same size asthe object.Ima...

IMAGE IN A PLANE MIRROR• The image is as far behind the mirror asthe object is in front of the mirror.Object distance d1 =...
IMAGE IN A PLANE MIRROR• The image is laterally inverted (left-to-right inversion)Left side of the object becomes the righ...
APPLYING THELAWS OF REFLECTION• To locate image formed in a plane mirror.EYEO
RAY DIAGRAMSStep 1 : Locate the image position.EYEIO
RAY DIAGRAMSStep 2 : Draw incident rays.(connect object O to reflected rays)EYEIO
RAY DIAGRAMSStep 2 : Draw reflected rays(connect Image I to eye)EYEIO


• To draw the mirror image of an object.APPLYING THELAWS OF REFLECTION
Diffraction, the bending of waves aroundcorners

Refraction, thebending of waveswhen a change ofspeed takes place

During the time of Newton andHuygens, only the first threewere recognized and observed. a) Rectilinear b) Reflection ...
Spite of scientific discussions in defense of thetheories, the problems were unresolved formore than a hundred years.In th...
The Photoelectric EffectAt the turn of the 20th century, it was observedthat electrons were emitted by some metalswhenever...
The photoelectric effect weakened the wave theory.An increase in light intensity is a result in theincrease in the velocit...
The electromagnetic waves make up what is calledcollectively as the Electromagnetic Spectrum.
The visible spectrum includes all radiation visible tothe human eye and is commonly called Light.All radiation above and b...

How much have you learned?1. According to James Clerk Maxwell, what is the relationship between light and EM waves?2. ...
What happens to light when it falls on the surface of the object?Light from a source travels in all direction.This ...

Part of the light coming from the source,passing through the air, and touching theboundary of a medium is reflected.The re...

The amount of reflected light depends on threefactors:1. The kind of medium the object is made.

























































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