Light from a distant star is focused by the lens onto the retina (Intro 1 figure) . With a pupil diameter of 3.0 mm, t...
Light from a distant star is focused by the lens onto the retina (Intro 1 figure) . With a pupil diameter of 3.0 mm, the intensity of light falling on the retina is illustrated by the graph below (Intro 2 figure) . The spot illuminated on the retina is about 8 ?m in diameter.When star gazing on a very dark evening, the pupil diameter will expand to much larger than 3.0 mm . Part A With an expanded pupil diameter, what will happen to the the total amount of light energy reaching the retina? It will increase. decrease. stay the same. Part B With an expanded pupil diameter, what will happen to the spread of the image on the retina? It will increase. decrease. stay the same.