PHYSICS
JAMB 2012 - Question 31
Physics 2012 JAMB Past Questions - Question 31: A pinhole camera is placed 300m in front of a building so that the image is formed on a screen 5cm from the pinhole .If the image is 2.5cm high ,the height of the building will be
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
D
Explanation
To find the height of the building, we can use similar triangles and the concept of similar triangles in geometry.
Let's denote the height of the building as 'H'. We can set up the following proportion:
(H / 300) = (2.5 / 5)
Cross-multiplying, we get:
2.5 * 300 = 5 * H
750 = 5H
Dividing both sides by 5, we find:
H = 750 / 5
H = 150
Therefore, the height of the building is 150 meters.