Name that Law
This law states that the incident angle is equal to the reflected angle.
Law of Reflection
What is the Law of Reflection?
The incident angle will be equal to the reflected angle
What is refraction?
It is when light enters a new medium and the angle at which the light travels changes.
What is total internal reflection?
It is when a light ray does not refract from one medium to another and only reflects.
How is a shadow produced?
By light rays being blocked from a certain spot
This law states that when a light ray enters a new medium it will change the angle that it travels at.
Law of Refraction
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When a light goes from a medium of lower index to one of higher index, the light will bend _____ the normal line.
Towards (Angle gets smaller)
What equation helps us calculate TIR?
Snell's Law
How are light rays emitted from a light source?
An infinite are emitted in all directions.
This law lets us calculate the indexes of mediums, or the angles that a ray might bend to.
Snell's Law
If an incident ray has a angle of 15 degrees, what will the reflected angle be?
15 degrees
When a light goes from a medium of higher index to one of lower index, the light will bend _____ the normal line.
Away (Angle gets bigger)
What is one condition for TIR to occur? There are two.
Light needs to be traveling from a higher index to a lower index, The light needs to be refracted at an angle of 90 degrees or greater.
Why are some shadows fuzzy? Describe the situation where a shadow might be fuzzy.
A shadow is fuzzy because some of the light rays are able to move over or under the object that is creating the shadow and make it look fuzzy.
This law allows us to see objects around us.
Law of Reflection
How does Reflection allow us to see objects and our surroundings?
Light bounces off of objects and into our eyes
What is missing from this image? (Hint: more than one thing is missing)
A refracted ray and reflected ray.
Can TIR occur when light is traveling from air to water? Explain why or why not.
No because light is not traveling from a higher medium to a lower medium.
What type of shadow will be produced from this image?
This law explains why it is difficult to grab a rock underneath the water
Law of Refraction
How does Reflection help us see car beams better when its foggy?
Image help
The light is able to reflect off the moisture in the air and into our lights.
When light hits a point between two mediums will it always travel into the new one? Explain.
No, it will not travel if TIR occurs.
If a light beam is traveling from a higher index of refraction to a lower one, and the light is able to make it through, does that mean that TIR could never occur for this situation? Explain.
No, if the angle that the light was entering at was changed then TIR could still occur
How will this image be projected? There are two answers.
Bigger and up-side-down