The focal length of a simple lens depends on the color (wavelength) of light passing through it. Why? Is it possible for a lens to have a positive focal length for some colors and negative for others? Explain.
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The focal length of a simple lens depends on the color (wavelength) of light passing through it. Why? Is it possible for a lens to have a positive focal length for some colors and negative for others? Explain.
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- *4. An object 3 mm high is placed 50 cm to the left of a converging lens of focal length 40 cm. A second converging lens with a focal length 10 cm is placed 220 cm to the right of the first lens. Where is the final image? Is it real or virtual? What will be the image size? Is it erect or inverted? 3 mm ↑ k -50 cm- f₁ = 40 cm -220 cm- f₂ = 10 cm1. A homeowner wishes to mount a floodlight on a wall of a swimming pool underwater so as to provide the maximum illumination of the surface of the pool for use at night. At what angle with respect to the wall would the light be pointed? The answer is 46 degrees. 2. In a slide projector, a slide is positioned 0.102 meters from a converging lens that has a focal length of 0.1 meters. At what distance from the lens must the screen be placed so that the image of the slide will be in focus? The answer is 5.1m 3. Compute the magnification for the slide projector in Q2. The answer is -50XSpherical aberration is due to light rays O a. passing through the outer portions of a lens not focusing at the same point as rays that pass through the center O b. of different wavelength not focusing at the same point O C. passing through the lens in the vertical direction not focusing at the same point as rays passing through the lens in the horizontal direction O d. passing through the outer portions of a lens being absorbed more than rays that pass through the center
- Light incident in a medium with an index of refraction 1.47 encounters a medium with an index of refraction 1.18. Which of the following best describes what can happen? If there isn't total internal reflection, then the light that refracts into the second medium bends away from the normal. There will never be total internal reflection and the light that refracts into the second medium will bend away from the normal. If there isn't total internal reflection, then the light that refracts into the second medium bends towards the normal. There can only be total internal reflection.*4. An object 3 mm high is placed 50 cm to the left of a converging lens of focal length 40 cm. A second converging lens with a focal length 10 cm is placed 220 cm to the right of the first lens. Where is the final image? Is it real or virtual? What will be the image size? Is it erect or inverted? 3 mm 1... -50 cm- f₁ = 40 cm 220 cm- f = 10 cm# ubj 11. What is the critical angle for light to stay inside a thin glass rod (n = 1.40) surrounded by air? What if the rod is surrounded by water?
- A1. As shown in Figure A1, a light ray is incident normal to one face of a 30°-60°-90° prism (n = 1.50) that is immersed in water (n = 1.33). Determine the exit angle 03. (a) Determine the exit angle 03. (b) Determine the critical angle for the prism-water system. n2 60.0° n1 Figure Al 021 30.0% D 1031. A ray of light is passing through air (n=1). It strikes a level surface of water (n=1.33) at an angle of 40° with respect to the surface of the water. The water is 10 cm thick. The light ray refracts and travels through the water. There is a level layer of clear polystyrene (n = 1.6) that the water is resting upon. The light ray hits the polystyrene level and travels through it, finally reaching a sheet of glass (n=1.45). Given that the speed of light in a vacuum is 3 x 108 m/s, calculate the speed of light in the water and the time it takes for the light to traverse the water layer. (actual question i need answered) *Using the arrangement in Problem 1, calculate the critical angle for total internal reflection at the polystyrene-glass interfacem 18 An amateur astronomer wants to build a small refracting telescope. The only lenses available to him have focal lengths of 7.00 cm, 12.0 cm, 19.0 cm, and 32.0 cm. H Q Search Part A What is the greatest magnification that can be obtained using two of these lenses M = Submit Part B —| ΑΣΦ L = Request Answer How long is the telescope with the greatest magnification? -- ΑΣΦ ? cm 6:27 12/5/20