Ppt Ref Dif Inter

Reflection

Reflection is the change in direction of a wavefront at an interface between two different

media so that the wavefront returns into the medium from which it originated. Common

examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the

angle at which it is reflected

Reflection

The law of reflection

The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected

The angle of incidence is

always ( өi )

equal to the angle of

reflection ( өr )

How much is the angle of reflection if the angle of incident is 30 degrees?

Diffraction

Diffraction refers to various phenomena which occur when a wave encounters an obstacle.

Italian scientist Francesco Maria Grimaldi coined the word "diffraction" and was the first to

record accurate observations of the phenomenon in 1665

Diffraction

In classical physics, the diffraction phenomenon is described as the apparent bending of waves

around small obstacles and the spreading out of waves past small openings.

Diffraction

Similar effects occur when light waves travel through a medium with a varying refractive

index or a sound wave through one with varying acoustic impedance. Diffraction occurs with all waves, including sound waves, water waves,

and electromagnetic waves such as visible light, x-rays and radio waves.

Diffraction

Which slit can bend the waves the greater, small opening or big opening?

interference

In physics, interference is the phenomenon in which two waves superpose each other to form a resultant wave of greater or lower amplitude. Interference usually refers to the interaction of

waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly

the same frequency.

interference

Constructive and destructive interference

interference

Diffraction- apparent bending of waves around small obstacles and the spreading out of waves past small openings

Reflection -the bouncing back of the wave as it hits a barrier

Interference - the phenomenon that occurs when two waves meet while traveling along the same medium