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Old Nov 5th 2009, 08:46 AM   #1
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a junior science question

today i encounter a junior science question which i have no idea.

that is

"why when we are looking at a faint star (of course, in the dark), if we "focus" on the edge of the star, then we will see a sharper / brighter star? "

The question is related to rod cells and cone cells in our retina.

Please explain if you can, I need help, thanks
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Old Nov 5th 2009, 08:52 AM   #2
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if looking at edge increases visual angle, then greater no of rods and cones are activated resulting in better vision. but i dont know why looking at edge increases visual angle.
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Old Nov 6th 2009, 07:13 AM   #3
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Originally Posted by r.samanta View Post
if looking at edge increases visual angle, then greater no of rods and cones are activated resulting in better vision. but i dont know why looking at edge increases visual angle.
but you sure that looking at edge will increase visual angle?

Actually i don't need an explanation with very deep knowledge, but I need a correct but rough explanation, thanks!
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