February 27, 2017

Homework Help: Physics

Posted by Sam on Sunday, January 25, 2009 at 8:23pm.

In the first application of
interferometric methods in radio
astronomy, Australian astronomers
observed the interference between a
radio wave arriving at their antenna
directly from the Sun and on a path involving reflection from the surface of the sea.
Assume that radio waves have a frequency of 6.0 × 107 Hz, and that the radio receiver is
25 m above the surface of the sea. What is the smallest angle θ above the horizon that
will give destructive interference of the waves at the receiver?

A converging lens has a focal length f, and a diverging
lens has a focal length –f, which has the same magnitude
as the converging lens. They are separated by a distance
D which is greater than f, as shown. Parallel light enters
from the left. Will the light be brought to a focus, and if
so where? Imagine that the parallel light rays in Problem 3 enter from the right. Explain why the
light will be brought to focus without using any equations.

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