Please help me answer these 2 questions. Table 1: One Lens Object DistanImage Di

Question

Please help me answer these 2 questions.

Table 1: One Lens Object DistanImage DistanceImage height Object DistanImage DistanceImage height 50.0 47.5 45.0 40.0 35.0 30.0 25.0 20.0 15.0 12.5 12.0 11.0 2.854 4.466 8.494 12.574 12.652 13.324 13.666 14.558 15.480 0.838 0.882 1.262 1.512 1.726 2.198 17.234 20.780 31.200 59.900 68.800 Where would you place the object to obtain an image as far away from the lens as possible? Where would you place the object to obtain an image located at the focal length of the lens (100 mm)?

Explanation / Answer

(a) f= 100 mm

image distance= infinity

using mirror formula

1/f= 1/di+1/do

1/100= 1/infinity + 1/do

1/100+0= 1/do

do = 100 mm

so object distance= 100 mm.

(b) f= 100mm

di= 100mm

1/f= 1/di+1/do

1/100= 1/100 + 1/do

1/100-1/100= 1/do

1/do = 0

do= infinity

so object has to be placed at infinity

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