LIGHT!!! (Radiant energy)
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1 LIGHT!!! (Radiant energy) Radiant energy includes light, microwaves, UV waves, radio waves and more Waves are energy that causes a disturbance. The medium that waves move through does not travel with the wave. (If it did, you would feel a breeze!) Medium the substance that the wave travels through Radiant waves are ElectromagneHc TRANSVERSE WAVES
2 Parts of a wave
3 Waves Larger amplitude means more energy Wavelength is the distance between waves Frequency is how close the waves are to one another. The closer they are, the more waves are produced in a given amount of Hme. Frequency is measured in Hertz Amplitude is the maximum distance a wave vibrates from its rest posihon.
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5 ElectromagneHc waves Do not need a medium to travel through They can travel through a vaccum (space without air molecules) Where do you find a vaccum?
6 ElectromagneHc waves travel through a vacuum like outer space Light waves are electromagnehc
7 Transverse Waves A wave in which the parhcles of the waves medium vibrate perpendicular to the direchon the wave is traveling
8 Wave interachons ReflecHon occurs when a wave bounces back aver striking a barrier RefracHon the bending of a wave as it passes from one medium to another
9 Radiant Energy Is transmiwed on tranverse waves Is electromagnehc
10 ElectromagneHc Spectrum
11 Visible Light
12 Absorb, reflect, transmit When light bounces off a surface it is When light does NOT pass through or bounce off, it is When light passes through a substance it
13 i QuesHons
14 Why do we see colors? The colors we see are the colors that are reflected from an object. Example: Something that appears to be green means that green light is NOT being absorbed. If all colors are reflected, the object appears to be white If all colors are absorbed, the object appears to be black
15 Visible light Why are white clothes cooler to wear in the summer? Why are black clothes hower to wear in the summer? What color clothing would you wear skiing? Why?
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17 Cow Eye
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19 Cut through the scelera
20 Vitreous humor Humor means fluid (Shakespeare uses this word a lot) In the eye it s a jello- like fluid
21
22 Convex lenses magnify an image
23 Convex lenses Bulge outward Refract light to a focal point Cause the image to appear bigger Are in the eyes of animals Thicker in the middle and thinner on the sides
24 Concave lenses
25 Concave lenses Bulge inward Cause light to diverge (spread out) Cause the image to appear smaller Are thin in the middle and thicker on the sides
26 It s the opposite for mirrors!!!! Convex mirror shrinks objects Image appears upright Concave mirror magnifies objects From a distance image appears upside down
27 Concave and convex mirrors Observe your image in the regular mirror. Describe what you see. Observe your image in the concave mirror. Write down your observahons. What happens as the mirror is further away? Observe your image in the convex mirror. Write down your observahons. What happens as the mirror is further away?
28 Light can be transmiwed, absorbed, reflected, or refracted
29 Lenses Convex Concave
30 Lenses form images by refrac3ng light. Lenses have curved surfaces that refract parallel light waves in different amounts. Convex lenses bend light inward toward a focal point. Convex Lens focal point Concave Lens principal axis
31 Flat mirror
32 Curved Mirrors Convex mirrors can make an image smaller. Objects in the mirror are closer than they appear? Concave mirrors can magnify an image making it look much larger
33 Op3cal technology makes use of light waves. Many ophcal tools are made by combining mirrors and lenses. Examples of ophcal tools include: telescopes laser fiber op3cs
34 Other ways light can bend Can light go around a corner? Can it travel through small cracks and openings? YES!!! In addihon to reflechng and refrachng light can also be diffracted (bent) UGH!! Too many words???? Refract light bends when it goes into a new medium (air, liquid, solid Reflect light bounces off an object Diffract when light hits an object it creates new waves that bend around corners
35 What happens when waves collide? This is called interference Interference when two waves overlap. The interference will either cause the wave to become stronger or weaker.
36 Transmi?ng Light Materials can be classified by the amount and type of light they transmit. Transparent materials let most light through so that the objects behind the material are visible. Translucent materials let light through, but they spread the light out so that objects cannot be clearly seen through them. Opaque materials do not let any light through.
37 Visible Light - wavelength
38 Primary Colors of Light The primary colors of light are Red, Blue, & Green Pigments can absorb certain wavelengths or light (certain colors) and reflect others. The primary colors of pigments are magenta, yellow, and cyan.
39 George Washington Carver Over his lifehme, George invented hundreds of uses for crops like peanuts, pecans, and sweet potatoes. His most famous invenhon was peanut buwer! He developed over 500 dyes and pigments from 28 different plants.
40 4.3 The eye is a natural op3cal tool. The eyes of humans and many animals use lenses to focus images on the rehna. The rehna detects images and sends informahon about them to the brain. 1 Light from an object is refracted by the cornea.! iris 4 An image is focused on the re3na. The light 2 passes through the iris and the pupil.! 3 The lens op3c refracts the nerve light more.
41 Polarized Light Polarized light waves are light waves in which the vibrahons occur in a single plane or direchon
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