ou have encouraged your little sister, who has just gotten glasses for her sever
ID: 2244256 • Letter: O
Question
b) If your sister's face is 180. mm-tall, how tall will it appear to be in the image (in mm)?
Explanation / Answer
the focal length is
f = - 1/6 = 0.16666 m = 16.666 cm
di = distance of image, do = distance of object
Image size I / object size O = I/O = - di/do = - f/(-f + do)
I/O = 16.666/(16.666 + 49.5) = 0.25188.
The image distance = do*0.2614 = 495*0.25188 = 124.6846 mm
The image size = 180*0.25188 = 45.3398 mm
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