The human eye has a lot in common with a pinhole camera, being essentially a sma
ID: 1654457 • Letter: T
Question
The human eye has a lot in common with a pinhole camera, being essentially a small box with a hole in the front (the pupil) and a detector at the back (the retina). The distance from the pupil to the retina is approximately 24 mm. Suppose you look at a 190-cm-tall friend who is standing 5.6 m in front of you. Assuming your eye functions like a pinhole camera, what will be the height, in mm, of your friend’s image on your retina?
Express your answer to two significant figures and include the appropriate units.
Explanation / Answer
from the defination of magnification of lens, we know that
M = i/o = h'/h
where i is the image dist, o is the object dist, h' is the image height and h is the object height.
image height = i/o x h = 190/560 x 24 = 8.14 mm
Hence, image height = 8.14 mm
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