Question 935922
Calculate the distance from the bulb to the corner of the table (I assume that's what you mean by tip).
{{{R^2=1.8^2+1^2+1^2}}}
{{{R^2=3.24+1+1}}}
{{{R^2=5.24}}}
Illuminance is inversely proportional to the square of the distance.
{{{k/1.8^2=300}}}
{{{k/5.24=X}}}
{{{X=300(3.24/5.24)}}}
{{{X=185.5}}}{{{lx}}}
Since the distance from the source to the edge of the table is 1.8 down, 1 up, and 1 over, the source is no longer directly over the point but at an angle,{{{ theta}}}.
{{{tan(theta)=sqrt(1^2+1^2)/1.8}}}
{{{theta=38.2}}} degrees
{{{En=X*cos(theta)=185.5*cos(38.2)=145.7}}} lx