Luminous
Source of light
Non-luminous
Observes and transfers light
Law of reflection
The angle of incidence is equal to the angle of reflection
Real image features
Projected
Inverted
Converging
Virtual image features
Not projected
Upright
Diverging
Refraction
Bending of light when it travels from one medium to another
LMT
Less dense to
More dense
Towards the normal
MLA
More dense to
Less dense
Away from the normal
If pass along the normal?
No bending of light
Speed of light
3 x 10^8 m/s
Refractive index(n)
Speed of light in a vacuum / Speed of light in medium
or
Sin i / Sin r
or
1 / Sin C
Total internal reflection
When there is only reflection and no refraction
When the incident ray approaches the critical angle…
the refracted ray travels at right angle to the normal
If the angle of incident is greater than critical angle…
no refraction
Velocity =
(v)
Frequency x Wavelength
fλ
Center of the lens
Optical centre
The distance between the centre of lens and the principal focus
Focal length
Point to which parallel rays (from distant objects) are focused
Principal focus
line through the centre of lens
Principal axis
Another name for converging lens
convex
Another name for diverging lens
concave
Formula for magnification
M=image size/object size
