OPTICS
ONE PAGE REVISION SHEET
REFLECTION OF LIGHT REFRACTION OF LIGHT TOTAL INTERNAL RELECTION
DEF: REFLECTION IS THE DEF: REFRACTION IS THE BENDING DEF: WHEN LIGHT MOVES FROM
BOUNCING BACK OF LIGHT INTO OF LIGHT AS IT PASSES FROM ONE DENSER TO RARER MEDIUM AND
THE SAME MEDIUM AFTER MEDIUM TO ANOTHER ANGLE OF INCIDENCE EXCEEDS
STRIKING A SURFACE. THE CRITICAL ANGLES ALL THE
KEY POINTS: Bend towards normal
LIGHT IS REFLECTED BACK
LAW OF REFLECTION: in denser medium
Lights bends away from normal in CRITICAL ANGLES: The angles of
INCIDENCE = REFLECTION rarer medium incidence for which the angles of
Snell’s law: refraction is exactly 90 if it
KEY POINTS: Incident ray
exceeds this angles so it is (TIR)
Reflected ray and normal all lies on
same plane
TYPES: n is the refractive index of media
SPECULAR: Smooth surface, clear
image. 1 Angles of incidence
Diffuse: Rough surface, scattered
image. Conditions: Angle of incidence
2 Angles of refraction must be greater than critical
Refractive index:(n) angles
O
c is the value of light in vaccum OPTICAL FIBRES: is the application
3x10^8 of total internal reflection. It is a
v speed of light in medium(speed of thin flexible strands of glass or
light is diff in all the medium) plastics which transmit light over
For example: GLASS ( 1.8) WATER larger distance with minimal loss
(1.33) ADV: high speed data
transmission(internet)
Minimal loss, Use in endoscopes
Real image: A image formed when lights ray actually meet (CONVERGE) after reflection or refraction
Can be obtained on screen: usually inverted:
Virtual image: an image formed when lights rays appears to meet(diverge)but it donot really
meet
cannot be obtained on screen: usually erect
ONE PAGE REVISION SHEET
REFLECTION OF LIGHT REFRACTION OF LIGHT TOTAL INTERNAL RELECTION
DEF: REFLECTION IS THE DEF: REFRACTION IS THE BENDING DEF: WHEN LIGHT MOVES FROM
BOUNCING BACK OF LIGHT INTO OF LIGHT AS IT PASSES FROM ONE DENSER TO RARER MEDIUM AND
THE SAME MEDIUM AFTER MEDIUM TO ANOTHER ANGLE OF INCIDENCE EXCEEDS
STRIKING A SURFACE. THE CRITICAL ANGLES ALL THE
KEY POINTS: Bend towards normal
LIGHT IS REFLECTED BACK
LAW OF REFLECTION: in denser medium
Lights bends away from normal in CRITICAL ANGLES: The angles of
INCIDENCE = REFLECTION rarer medium incidence for which the angles of
Snell’s law: refraction is exactly 90 if it
KEY POINTS: Incident ray
exceeds this angles so it is (TIR)
Reflected ray and normal all lies on
same plane
TYPES: n is the refractive index of media
SPECULAR: Smooth surface, clear
image. 1 Angles of incidence
Diffuse: Rough surface, scattered
image. Conditions: Angle of incidence
2 Angles of refraction must be greater than critical
Refractive index:(n) angles
O
c is the value of light in vaccum OPTICAL FIBRES: is the application
3x10^8 of total internal reflection. It is a
v speed of light in medium(speed of thin flexible strands of glass or
light is diff in all the medium) plastics which transmit light over
For example: GLASS ( 1.8) WATER larger distance with minimal loss
(1.33) ADV: high speed data
transmission(internet)
Minimal loss, Use in endoscopes
Real image: A image formed when lights ray actually meet (CONVERGE) after reflection or refraction
Can be obtained on screen: usually inverted:
Virtual image: an image formed when lights rays appears to meet(diverge)but it donot really
meet
cannot be obtained on screen: usually erect
