An object is placed 20 cm away from a pin-hole camera. If the length of the camera is 10 cm and the

JAMB Physics 2023 303 views
Source: JAMB · 2023

An object is placed 20 cm away from a pin-hole camera. If the length of the camera is 10 cm and the height of the image formed is 5 cm. Find the height of the object.

  1. 10 cm ✓
  2. 15 cm
  3. 5 cm
  4. 20 cm
Explanation

In a pinhole camera, similar triangles give: object height ÷ object distance = image height ÷ camera length.

h ÷ 20 = 5 ÷ 10, so h = 20 × 0.5 = 10 cm.

Was this explanation helpful?

Something wrong or missing? Tell us — we read every report and fix issues fast.

pastQuestions.ng pastquestions.ng