<p>Suppose&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn>10</mn><mrow><mo>-</mo><mn>17</mn></mrow></msup></math>&nbsp;J of light energy is needed by the interior of human eye to see an object. The photons of green light (<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#955;</mi></math>&nbsp;= 550 nm) needed to see the object are:</p>