The lens is removed from the camera and held at a distance of 4 cm from an ant of length 2mm. what is the length of the ant? (the image distance(v) is 10cm and the focal length was 7.5cm before the lens was removed)

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I'm not sure if to treat this problem like a pinhole camera. I'm really confused....please help.

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Answer 1 · 2018-06-17T11:18:17

The length of the ant is #=5mm#

The magnification is

#m=h_i/h_0=-d_i/d_0#

Therefore,

#h_i/0.2=-((-10))/(4)#

#h_i=10/4*0.2=0.5cm=5mm#