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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

Two plane mirrors intersect at right angles. A laser beam strikes the first of them at a point 11.5 cm from their point of intersection, as shown in Fig. E33.1. For what angle of incidence at the first mirror will this ray strike the midpoint of the second mirror (which is 28.0 cm long) after reflecting from the first mirror?

The VLBA (Very Long Baseline Array) uses a number of individual radio telescopes to make one unit having an equivalent diameter of about 8000 km. When this radio telescope is focusing radio waves of wavelength 2.0 cm, what would have to be the diameter of the mirror of a visible-light telescope focusing the light of wavelength 550 nm so that the visible-light telescope has the same resolution as the radio telescope?

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Where must you place an object in front of a concave mirror with radius Rso that the image is erect and times the size of the object? Where is the image?

.. DATA While researching the use of laser pointers, you conduct a diffraction experiment with two thin parallel slits.

Your result is the pattern of closely spaced bright and dark fringes shown in Fig. P36.63. (Only the central portion of the pattern is shown.) You measure that the bright spots are equally spaced at centre to centre (except for the missing spots) on a screen that is from the slits. The light source was a helium鈥搉eon laser producing a wavelength of . (a) How far apart are the two slits? (b) How wide is each one?
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