Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high
A
10 cm
B
16 cm
C
5 cm
D
14 cm
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Magnification = \(\frac{\text{Length of camera}}{\text{distance of object from pin hole}}\)
m = \(\frac{12}{60}\)
= 0.2
Also magnification m = \(\frac{\text{Height of image}}{\text{Height of object}}\)
∴ Height of image = m \times height of object
= 0.2 \times 70
= 14cm
Source: Myschool Past Questions Archive (Record #46396)