Physics Chp 15
description
Transcript of Physics Chp 15
![Page 1: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/1.jpg)
Physics Chp 15
![Page 2: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/2.jpg)
• What happens when “light” hits a transparent material?
![Page 3: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/3.jpg)
• Some of it reflects and/or refracts
• Refraction is the bending of light due to a change in it’s speed in the new material
![Page 4: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/4.jpg)
• Index of refraction
• n = c/v 1 or greater
![Page 5: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/5.jpg)
• While θi=θr for reflection it isn’t always true for refraction, it depends in n
• Snell’s Law
• n1sinθ1 = n2sinθ2
![Page 6: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/6.jpg)
![Page 7: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/7.jpg)
• So why do objects under the water look closer to the surface and farther away from us than they really are?
![Page 8: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/8.jpg)
![Page 9: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/9.jpg)
• Why does “light” refract?
![Page 10: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/10.jpg)
![Page 11: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/11.jpg)
• Lenses use refraction to redirect light
• Converging – brings the light towards the axis
• Diverging – directs the light away from the axis
![Page 12: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/12.jpg)
![Page 13: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/13.jpg)
• Ray Diagrams• Converging• 1 – from tip parallel then towards f• 2 – from tip thru f then parallel • 3 – from tip thru center
![Page 14: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/14.jpg)
![Page 15: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/15.jpg)
• Ray Diagram• Diverging• 1- parallel then away from f• 2- towards far f then parallel• 3 – thru center
![Page 16: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/16.jpg)
![Page 17: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/17.jpg)
• Thin lens equation
• Magnification equation
1 1 1
o id d f
i i
o o
h dmh d
![Page 18: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/18.jpg)
• Signs
• f + converging
• do + on the left of lens
• di + on the right of lens
• m + for upright
![Page 19: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/19.jpg)
• Sketch a ray diagram for a converging lens with focal length of 1 m and the object 0.5 m left of the lens and 0.2 m tall. Then calculate the distance of the image as well as it’s height.
![Page 20: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/20.jpg)
1 1 10.5 1id
10.2 0.5ih
![Page 21: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/21.jpg)
• Multiple Lenses image 1 = object 2
![Page 22: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/22.jpg)
• Eye Type of lense?
• Near point – closest object distance that still gives a clear image
• Far point – farthest object distance that still gives a clear image
![Page 23: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/23.jpg)
• Nearsightedness – far point issue, image in front of retina, use a diverging lens
• Farsightedness – near point issue, image is behind the retina, use a converging lens
![Page 24: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/24.jpg)
• Microscope
• Telescope
![Page 25: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/25.jpg)
• If n1 > n2 then there is an angle where θ2 = 90o
• Sinθc = n2 / n1
• θc is the critical angle
• If θ = θc then the “light” totally internally reflects
![Page 26: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/26.jpg)
![Page 27: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/27.jpg)
• Since each wavelength refracts differently prisms cause the rainbow from white light
• Also rainbows in the sky are caused by water droplets dispersing the light back towards us.
![Page 28: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/28.jpg)
• Lens Aberrations – not a single focal pt
• Spherical aberrations – farther from the principal axis moves the focus
• Chromatic aberrations – different wavelengths refracting differently
![Page 29: Physics Chp 15](https://reader035.fdocuments.net/reader035/viewer/2022062501/56816679550346895dda1a05/html5/thumbnails/29.jpg)