Chapter 35: Q 4. (page 1016)
A red card is illuminated by red light. What color will the card appear? What if it’s illuminated by blue light?
Red in first case and black in second case.
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Alpha Centauri, the nearest star to our solar system is light years away. assume that alpha centauri has a planet with an advanced civilization. professor Dhg, at the planet's Astronomical Institute, wants to build a telescope with which he can find out whether any planets are orbiting our sun.
(a). What is the minimum diameter for an objectives lens that will just barely resolve Jupiter and the sun? The radius of Jupiter's orbit is Assume
(b). Building a telescope of the necessary size does not appear to be a major problem. What practical difficulties might prevent professor Dhg's experiment from succeeding?
Mordern microscopes are more likely to use a camera than human viewing. This is accomplished by replacing the eyepiece in figure with a photo-ocular that focuses the image of the objectives to a real image on the sensor of a digital camera. A typical sensor is wide and consists of wide pixels. suppose a microscopist pairs a objectives with a photo-ocular
a. what is the field of view? That is what width on the microscope stage in fills the sensor?
b. The photo of a cell is in a diameter. what is the cell's actual diameter in?
Suppose you wanted special glasses designed to let you see underwater without a face mask. Should the glasses use a converging or diverging lens? Explain.
High-power lasers are used to cut and weld materials by focusing the laser beam to a very small spot. This is like using a magnifying lens to focus the sun’s light to a small spot that can burn things. As an engineer, you have designed a laser cutting device in which the material to be cut is placed 5.0 cm behind the lens. You have selected a high-power laser with a wavelength of 1.06 mm. Your calculations indicate that the laser must be focused to a 5.0@mm@diameter spot in order to have sufficient power to make the cut. What is the minimum diameter of the lens you must install?
A diffraction-limited lens can focus light to a 10diameter spot on a screen. Do the following actions make the spot diameter larger, make it smaller, or leave it unchanged?
A. Decreasing the wavelength of the light.
B. Decreasing the lens diameter.
C. Decreasing the lens focal length.
D. Decreasing the lens-to-screen distance.
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