You want to decrease the exposure time for a camera. To get a good exposure what else do you need to change and how should you change it? Explain.
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You want to decrease the exposure time for a camera. To get a good exposure what else do you need to change and how should you change it? Explain.
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- 1) A microscope has a 12.0x eyepiece and a 59.0x objective lens 20.0 cm apart. What is the effective magnification of the microscope? A. 12.0x. B. 47.0x. C. 59.0x. D. 71.0x. E. 708x. 2) A microscope has a 12.0x eyepiece and a 59.0x objective lens 20.0 cm apart. What is the focal length in centimeter of the eyepiece? A. 1.26. B. 2.08. C. 2.45. D. 3.19. E. 3.57 3) A microscope has a 12.0x eyepiece and a 59.0x objective lens 20.0 cm apart. What is the focal length in centimeter of the objective? A. 0.247. B. 0.298. C. 0.303. D. 0.391. E. 17.9.29 303. I have a convex lens of focal length 40 cm and diameter 10 cm. It's a clear day and I use it to focus an image of the sun onto a piece of paper. What is the diameter of the image? (The angular size of the sun as seen from the earth is 32' = 0.53 deg) b. By what factor is the sun's energy in the image increased compared to the incident sunlight? c. The ambient temperature is 90F. Assuming the temperature of the paper in the sun's image is that same factor higher as in part b, will the paper catch fire? (Recall, paper burns at "Fahrenheit 451")
- The image produced by a converging lens is upside down. Our eyes have converging lenses. Does this mean the images we see are upside down on our retinas? Explain.1. 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 -50X1. If a lens is to focus parallel light rays on a screen 50-cm away, what diopter would it have? Explain.
- Similar to the above question, I have a refracting telescope with an objective lens focal length f=200 mm. I have three possible eyepiecesI can use with this telescope, having focal lengths of 9 mm, 25mm and 50 mm. I want to look at a cluster of stars which are well spread apart from each other on the sky. Which eyepiece would I best use for this? A. 9 mm B. 25 mm C. 50 mm D. It doesn't matter which oneDetermine the critical angle of the following materials when surrounded by water (n = 1.33):a. teflon (n = 1.38)b. Pyrex glass (n = 1.47)c. Polycarbonate glass (n = 1.59)d. Sapphire gemstone (n = 1.77)e. Diamond (n = 2.42)A certain telescope has an objective mirror with an aperture diameter of 200. mm and a focal length of 2.00x 10 3 mm. It captures the image of a nebula on photographic film at its prime focus with an exposure time of 1.50 min. To produce the same light energy per unit area on the film, what is the required exposure time to photograph the same nebula with a smaller telescope that has an objective with a 60.0-mm diameter and a 900.-mm focal length?
- 2. Show that the minimum distance between a real object and its real image given by a convergent lens of focal length f is 4f. Get q as a function of p from 1/p + 1/q = 1/f. Take the derivative of s = p +q to find the value of p for which s is minimum.5. Q7) Problem 53: Page 110 A camera with a 50 mm focal length lens is being used to photograph a person standing 3.00 m away. (a) How far from the lens must the film be? (b) If the film is 36 mm high, what fraction of a 1.75 m-tall person will fit on it? Note: First find Magnification then consider film height as image height and find the object height and compare it with1.75 m. (Ans: 0.0508 m, 100%)4. Assume selecting two Crown glasses with na = 1.52 and different Abbe numbers (va) to make following 4 lenses with the same focal length (f), but different lens shape factor (s). Which lens has the smallest spherical and chromatic aberrations? A. va = 81.8, s = 2. В. Va B. va = 81.8, s = 1. C. va = 66.8, s = 2. D. va = 66.8, s = 1. %3D %3D %3D