An object of height 4cm is placed in front of a cuboid pinhole camera of size 6cm. If the image formed is 2cm high; how far is the object from the pinhole?

A. 3.0 cm
B. 8.0 cm
C. 12.0 cm
D. 16.0 cm

Correct Answer:

Option C = 12.0 cm

Explanation

Magnification = (image height)/object height
= (lenght camera)/object distance from pin-hole
∴(2)/4 = (6)/X
X (4 x 6)/2 = 12 cm