document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1130247>Question 1130247</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The focal length f of a lens is given by the formula:\r<BR>\n" );
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document.write( "1/f = 1/(d1) + 1/(d2)\r<BR>\n" );
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document.write( "where d1 is the distance from the object to the lens and d2 is the distance from the lens to the image. Solve the formula for d1. (Simplify your answer completely.) </SPAN>\n" );
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