document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=147441>Question 147441</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A laser beam is transmitted with a \"width\" of 0.00200 degree.  What is the diameter d of a spot of the beam on an object 258,000km distant? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #107812 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=107812\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A laser beam is transmitted with a \"width\" of 0.00200 degree.  What is the diameter d of a spot of the beam on an object 258,000km distant?<BR>\n" );
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document.write( "Draw the picture (an isosceles triangle)<BR>\n" );
document.write( "Draw a perpendicular bisector forming two right triangles at the diameter line.<BR>\n" );
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document.write( "Pick one of the triangles; it has angle 0.001 degree and base 258,000 km<BR>\n" );
document.write( "Find the altitude (a)<BR>\n" );
document.write( "tan(0.001) = a/258,000<BR>\n" );
document.write( "a = 258000*tan(0.001)<BR>\n" );
document.write( "a = 4.50 km<BR>\n" );
document.write( "That is the radius of the beam.<BR>\n" );
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document.write( "Diameter of the beam = 2*4.5 = 9 km<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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