Unit 33 Optics

Unit 33 - Optics,[object Object],Optics is the study of the behavior and properties of light.,[object Object],This includes it’s interactions with objects including mirrors, lenses, and substances which reflect or scatter light.,[object Object]

When Light Strikes an Object,[object Object],When light strikes an object, the light can be reflected, transmitted, scattered, or absorbed.,[object Object]

Magnification or Reduction,[object Object]

Mirrors ,[object Object],Plane mirror,[object Object],Mirrors reflect light at the same angle it receives it.,[object Object],But, if the mirror is curved…,[object Object]

Mirrors ,[object Object],Have you ever gone to the fun house and looked at yourself in the many different mirrors there? ,[object Object],Have you ever wondered how the image forms? ,[object Object],The image formed is a result of reflection, which you learned about in the previous unit. ,[object Object],[object Object]

A plane mirror is a flat mirror ,[object Object],Plane mirror,[object Object]

Plane Mirror,[object Object],[object Object]

Incident ray = the incoming ray that approaches the mirror

Angle of incidence = the angle the incident ray makes wit a line drawn perpendicular to the surface of the mirror.

Reflected ray = the ray the mirror reflects from the incident ray.

Angle of reflection = the angel the reflected ray makes with the perpendicular line. ,[object Object],Plane mirror,[object Object]

- Reflection and Mirrors,[object Object],Concave Mirrors,[object Object],A mirror with a surface that curves inward like the inside of a bowl is a concave mirror.,[object Object]

Parabolic Mirrors,[object Object],They can reflect the light to a focal point, making it the strongest signal possible.,[object Object],Satellite dishes direct the radiowaves to the antenna which sits at the focal point,[object Object],Parabolic mirrors direct sunlight to a focus to absorb energy and generate electricity.,[object Object]

The Focal Point,[object Object]

Concave Mirrors,[object Object],Ray diagrams show where an image forms and the size of the image. The steps below show how to draw a ray diagram.,[object Object]

Concave Mirrors,[object Object],Concave mirrors can form either “virtual images” or “real images”,[object Object]

Convex Mirrors,[object Object],A mirror with a surface that curves outward is called a convex mirror.,[object Object]

Comparing and Contrasting,[object Object],As you read, compare and contrast concave and convex mirrors in a Venn diagram like the one below. Write the similarities in the space where the circles overlap and the differences on the left and right sides.,[object Object],Concave Mirror,[object Object],Convex Mirror,[object Object],Real images,[object Object],Virtual images,[object Object],Curves outward,[object Object],Enlarged images,[object Object],Reduced images,[object Object],Curves inward,[object Object]

,[object Object],Quick Lab – everyone go get a spoon!!!,[object Object], ,[object Object],Situation 1,[object Object],Grab a spoon and hold it close to your face so the back side of the spoon is toward your face, as shown in Figure 33.1.4. Observe your image in the spoon and slowly move the spoon away from your face. What do you observe? Is the spoon acting as a concave or convex mirror in this situation?,[object Object]

Convex Versus Concave,[object Object],When the back side of the spoon is facing you, it is acting as a convex mirror. ,[object Object],[object Object]

A virtual image cannot be reflected back onto a screen.,[object Object]

When the front side of the spoon is facing you, it is acting as a concave mirror. ,[object Object],[object Object]

When the object is outside the focal point, the image becomes a real image and it is inverted.

A real image means that a screen could be placed there and the image would appear.

An inverted image has been flipped upside down.

You may have noticed that sometimes the image in the spoon seemed to get larger or smaller. If an image gets larger, it will have a positive magnification and if the image gets smaller it will have a negative magnification.,[object Object]

- Refraction and Lenses,[object Object],Lenses,[object Object],A lens is a curved piece of glass or other transparent material.,[object Object]

Lenses,[object Object],An object’s position relative to the focal point determines whether a convex lens forms a real image or a virtual image.,[object Object]

Lenses,[object Object],A concave lens can produce only virtual images because parallel light rays passing through the lens never meet.,[object Object]

Asking Questions,[object Object],Question,[object Object],Answer,[object Object],When does refraction occur?,[object Object],When light rays enter a medium at an angle,[object Object],What are the types of lenses?,[object Object],Concave and convex lenses,[object Object]

Light entering the eye first enters through the cornea, where it is refracted and begins to focus the light through the pupil. The pupil will expand during times of low light in order to allow more light to enter the eye. During times of bright light it will contract. When the pupil contracts, the iris gets larger and when the pupil expands, the iris gets smaller. After light passes through the pupil it then enters the convex lens in your eye. This lens focuses the light onto the light sensor cells on the back of your eye called rods and cones which are collected at the retina. The area where the nerve endings come together to form the optic nerve create a blind spot.,[object Object]

Correcting Vision,[object Object],Concave lenses are used to correct nearsightedness. Convex lenses are used to correct farsightedness.,[object Object]

Unit 33 Optics

Unit 33 Optics

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Unit 33 Optics