Light/Cahaya/نور

Light Cahaya نور

Qazim,Danial,Dhiya

Rays And Angle

• Incident Ray

• Reflected Ray

• Angle Of Incident

• Angle Of Refraction

• Normal

• This Is What We Called Law Of Reflection

Reflection Of Light

• Light travels in a straight line.

• It changes direction when it hits a shiny surface.

• does not reflect properly when the surface is dull

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

Refraction Of Light

• refraction is when light passes through another medium that is varying density

• the pencil looks like it is split but it is not because the pencil travels in another medium

• This is because its speed changes

• 2 laws of refraction

• 
  

• 
  

Refractive Index

• The quantity that describes how much light is slowed down

• speed of light = 3 x 10^8 meter per second

•  $n$   = speed of light in vacuum/speed of light in the material

Lenses

• Converging lenses : thicker in the middle than at edges.

• Diverging lenses : thinner in the middle than at edges.

• Principal focus : the point where the rays are concentrated together.

• The thicker the lens, the closer the principal focus to the lens.

Real Image

• Is the collection of focus points of light rays coming from an object.

• It is made by converging rays.

Multiple Choice

The ray of light that strikes a reflecting surface is called ________.

• incident ray

• reflected ray

• normal ray

• none of the above

Multiple Choice

Which figure represents the path light takes through a converging lens?

Multiple Choice

The above lens is a type of ___.

• diverging lens

• converging lens

• divergent lens

• convergent lens

Multiple Choice

How does light behave as it enters these mediums?

• continue its path as straight line.

• bends toward the normal

• bends away from the normal

• reflects

Multiple Choice

Light travels in ..........

• A Lamborghini

• A straight line

• A curved line

• A Boeing 747

• Malaysia Airlines

Multiple Choice

What causes light to appear refracted?

• temperature

• speed

• weather

• climate

Multiple Choice

Light passes into a glass block. Which is the angle of refraction?

• A

• B

• C

• D

Multiple Choice

Swimming pools and the ocean look shallower than they really are due to:

• reflection

• dispersion

• refraction

• total internal reflection

Multiple Choice

The point where the rays meet is known as....

• single point

• the focal point

• refraction

• concentrated point

Multiple Choice

Is a converging lens thicker or thinner in the middle?

• Thicker

• Thinner

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