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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

For what range of object positions does a concave spherical mirror form a real image? What about a convex spherical mirror?

Could the Young two-slit interference experiment be performed with gamma rays? If not, why not? If so, discuss differences in the experimental design compared to the experiment with visible light.

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