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Light Waves Sec 1.

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Presentation on theme: "Light Waves Sec 1."— Presentation transcript:

1 Light Waves Sec 1

2 Light Waves Strike objects
Reflected Absorbed Transmitted

3 Properties of objects Opaque Transparent Translucent

4 Opaque A material that reflects or absorbs all of the light that strikes it.

5 Transparent Material transmits light
Light passes through allowing you to see what is on the other side

6 Translucent Some light passes through
Material scatters light as the light passes through You cannot see details

7 Reflection Two kinds of wave reflection Regular and Diffused

8 Regular Reflection Occurs when parallel rays of light hit a smooth surface All the rays are reflected at the same angel

9 Diffuse Reflection When parallel rays of light hit a bumpy, or uneven surface The rays are reflected at different angels

10 Mirrors Sheet of glass Smooth, silver-colored coating
When light passes through the mirror, the back coating causes the light to reflect regularly, allowing you to see an image

11 Image Is a copy of an object formed by reflected or refracted rays of light

12 Plane Mirror Flat mirror Produces a image that is right-side up and
The same size as the object being reflected

13 Virtual Image The image you see when you look in a plane mirror is a virtual image Right-side up or upright

14 Concave Mirrors Surface curves inward
Can form virtual images, real images, or no image Depends on position of the object in relation to the focal point

15 Real Image Formed when rays actually meet at a point
The images are upside down, or inverted

16 Focal Point The point at which the rays meet

17 Convex Mirrors A mirror with a surface that curves outward
Images are always virtual

18 Refraction and Lenses Sec 2

19 Index of refraction measure of how much a ray of light bends when it enters that material

20 Mirages Is an image of a distant object caused by refraction of light
Page 245

21 Concave lens Is thinner in the center than at the edges

22 Convex lenses Is thicker in the center than at the edges

23 Color Sec 3

24 Color The color of an object is the color of light it reflects
White=reflects all colors Black= absorbs all colors

25 Primary Colors Three colors that can be used to make any other color
Red, green, and blue Any two primary combined in equal amounts produce a secondary color

26 Seeing Light Waves Sec 4

27 The Eye Organ System Each part plays an important part in helping you see

28 Cornea Light enter the eye through this transparent surface
The cornea protects the eye It also acts as a lens bending light waves as they enter the eye

29 Iris Is a ring of muscle that contracts and expands
This changes the amount of light that enter the eye Also give the eye color

30 Pupil Looks black As light dims, the pupil enlarges allowing in more light Vis versa

31 Lens Behind the pupil Refracts light, forming and image Page 257

32 Retina Layer of cells lining the inside of the eye
Contains many of tiny, light-sensitive cells called, rods and cones

33 Rods Rods contain pigments that react to small amounts of light
Important for seeing at night

34 Cones Respond to color Three types: red, blue, and green
Function with bright

35 Optic Nerve The signals generated by the rods and cones travel to the brain along a short, thick nerve The brain turns the image right-side up

36 Correcting Vision Lenses in glasses are either concave or convex
The type of lens used depends on whether the eye is too long or too short

37 Nearsightedness Person can see nearby things clearly, but objects at a distance appear blurry Eyeball is a little to long Concave lens correct this

38 Farsightedness Person can see far away, but objects nearby appear blurry Eyeball is too short This is corrected with convex lenses


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