Light
What is light?

https://www.strawpoll.me/20086756

https://www.youtube.com/watch?v=7u_UQG1La1o&t=121s
Electromagnetic Waves

Lights are electromagnetic waves. They are made up of magnetic field and
electric field.

They travel at 300,000 km/sec
Electromagnetic Spectrum
Reflection of Light
When light hits on the surface, it bounces off and
creates a reflection pattern.
For smooth surface, the angle of incident is equal to
angle of reflection.
Refraction of Light

When light passes through from medium to another medium, the speed of
light changes.

V = ƛf

When light pass through a medium, the frequency does not change but the
wavelength and speed changes.
Snell’s Law
Refractive Index
Speed of light in air is 300,000 km/s
Critical Angle
Convex lens
Diffraction

Bending of the light when it pass through a gap.
Transparent Materials
 Objects
that allow light to pass through is
called transparent.
 Electrons
 Each
are connected to nucleus like spring.
spring will vibrate at their own
frequency, they are called natural frequency.

Lenses
Eyes Vs Camera