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Light & Optics

Light & Optics

Udhay, Cole, and Oliver

Light & Optics

Reflection

REFLECTION

The throwing back of light by a body or surface of light. Reflection is the change in direction of a wavefront at a interface between two different media.

What causes reflection?

What Is Causes Reflection?

Reflection occurs when light hits a surface and the light bounces off of the surface. Then projects onto another surface at the same angle.

Law Of Reflection

The law of reflection is when you shine a light at a reflective surface at a certain angle. When the light reflects off it has to be at the same angle as you shined it at the reflective surface.

Law of Reflection

Types Of Reflection

There are 2 different types of reflection, Diffuse Reflection, and Regular Refletion. The Difference Between Both of these types of reflections is the type of surface your reflection light onto.

Types of Reflection

Diffuse Reflection

Regular Reflection

- The Angle of rays after reflection stays the same.

- Image Is clear.

- Reflects off of smooth surface

- The Angle of rays after reflection goes in different dierections.

- Rough and Uneven surface.

Refraction

Change in direction of propagation of any wave as a result of its traveling at different speeds at different points along the wave front.

REFRACTION

Cause Of Refraction

The cause of refraction is light that travels at different speeds. Onto a object and then the light bends.

Cause Of Refraction

4 Common Problems Found in Humans with Refraction

  • Nearsightedness makes far-away objects look blurry

  • Farsightedness makes nearby objects look blurry

  • Refraction can make far-away and nearby objects look blurry or distorted (Astigmatism)

  • Refraction also makes it hard for middle-aged and older adults to see things up close

( Presbyopia )

Common Day Examples

Common Day Examples

  • Pool water appears to not be as deep as it is but it really is deep.
  • Rainbow Formation
  • Glasses
  • Camera Lenses

FORMATION OF IMAGES THROUGH LENSES & MIRRORS

Convex

Mirrors

Convex mirrors are curved mirros that are curved outwards. They are found mostly on vehicle mirrors.

Converging

Rays

Converging

&

Divering Rays

Converging rays are rays the converge after shining a light in a double convex lense. Diverging Rays are ray that spread apart from each other when a light is shined into a concave lense.

Concave Mirrors

A concave mirror is a reflecting surface shaped like the inside of a spoon. When light rays hit the concave mirror they reflect off in different angles and meet in a area called the Focal Point.

Concave Mirrors

Light Absorption

Light Absorption is the process of light being absobed and being turned into Energy.

ABSORPTION

How does Light Absorption Happen?

When light hits a surface the gets absorbed and gets turned into energy. When electrons absorb energy they get "excited" they move to a higher energy level.

Types of Light Absorption.

Atomic

Absorption

Molecular Absorption

Molecular absorption is a process in which light energy with certain wavelength is absorbed by a molecule during the interaction with light.

Analytical technique used to determine how much of certain elements are in a sample. It uses the principle that atoms and can absorb light at a unique wavelength.

Examples of Light Absorption.

Examples of Light Absorption

Opaque Objects: The opaque objects such as wood, coal, organic matter.

Black Objects: The light falling on the surface of a black coloured object does not bounce away, but instead, it gets absorbed.

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