An object of height 4cm is placed in front of a cuboid pinhole camera of size 6 cm. if the image formed is 2 cm high, how far is the object from the pinhole?
Magnification = (image height)/object height
= (lenght camera)/object distance from pin-hole
∴(2)/4 = (6)/X
X (4 x 6)/2 = 12 cm
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