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Chapter 5: Q3DQ (page 1151)

The laws of optics also apply to electromagnetic waves invisible to the eye. A satellite TV dish is used to detect radio waves coming from orbiting satellites. Why is a curved reflecting surface (a 鈥渄ish鈥�) used? The dish is always concave, never convex; why? The actual radio receiver is placed on an arm and suspended in front of the dish. How far in front of the dish should it be placed?

Short Answer

Expert verified

A concave dish is used to focus the parallel rays.

Step by step solution

01

Concave mirror features

A concave mirror is actually a hollow sphere that is cut into parts and the outer surface is painted. Light converges at a point when it is reflected from the surface of the mirror. Hence it is known as a converging mirror. A concave mirror is used to magnify images.

02

Answer explanation

From the above explanation, we have seen that a concave mirror is used to converge the rays of the light, and created the desired real image at the receiver end. The image is a very distinct object and is at the focal point of the surface. Hence a concave mirror is used.

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Most popular questions from this chapter

You are in your car driving on a highway at 25m/swhen you glance in the passenger-side mirror (a convex mirror with radius of curvature 150 cm) and notice a truck approaching. If the image of the truck is approaching the vertex of the mirror at a speed of 1.9 m/swhen the truck is 2.0 m/sfrom the mirror, what is the speed of the truck relative to the highway?

Herring and related fish have a brilliant silvery appearance that camouflages them while they are swimming in a sunlit ocean. The silveriness is due to plateletsattached to the surfaces of these fish. Each platelet is made up of several alternating layers of crystalline guanine 1n= 1.802 and of cytoplasm (n= 1.333, the same as water), with a guanine layer on the outside in contact with the surrounding water (Fig.). In one typical platelet, the guanine layers are 74 nm thick and the cytoplasm layers are 100 nm thick. (a) For light striking the platelet surface at normal incidence, for which vacuum wavelengths of visible light will all of the reflections R1 , R2 , R3 , R4 , and R5 , shown in Fig., be approximately in phase? If white light is shone on this platelet,

what color will be most strongly reflected (see Fig. 32.4)? The surface of a herring has very many platelets side by side with layers of different thickness, so that allvisible wavelengths are reflected. (b) Explain why such a 鈥渟tack鈥� of layers is more reflective than a single layer of guanine with cytoplasm underneath. (A stack of five guanine layers separated by cytoplasm layers

reflects more than 80% of incident light at the wavelength for which it is 鈥渢uned.鈥�) (c) The color that is most strongly reflected

from a platelet depends on the angle at which it is viewed. Explain why this should be so. (You can see these changes in color by examining a herring from different angles. Most of the platelets on these fish are oriented in the same way, so that they are vertical when the fish is swimming.)

When viewing a paper of art that is behind glass, one often is affected by the light that is reflected off the front of the glass (called glare), which can make it difficult to see the art clearly. One solution is to coat the outer surface of the glass with a film to cancel part of the glare. (a) If the glass has a refractive index 1.62 and you use TiO2, which has an index of refraction of 2.62 , as the coating, what is the minimum film thickness that will cancel light of wavelength 505nm? (b) If this coating is too thin to stand up to wear, what other thickness would also work? Find only the three thinnest ones.

A very thin soap film (n = 1.33), whose thickness is much less than a wavelength of visible light, looks black; it appears to reflect no light at all. Why? By contrast, an equally thin layer of soapy water (n = 1.33) on glass (n = 1.50) appears quite shiny. Why is there a difference?

An object is 16.0 cm to the left of a lens. The lens forms an image 36.0 cm to the right of the lens. (a) What is the focal length of the lens? Is the lens converging or diverging? (b) If the object is 8.0 mm tall, how tall is the image? Is it erect or inverted? (c) Draw a principal-ray diagram.
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