JAMB Physics 2015 Objective — Question 7
Question 7 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2015 Objective paper, with the correct answer and a full explanation.
Advertisement
If a document is to be produced using a duplicating camera, where should the document be placed in order to obtain an exact copy?
- A. At the point which is twice the focal length of the lens of the cameraCorrect
- B. At the optical centre of the lens of the camera
- C. Between the principal focus and a point twice the focal length of the lens of the camera
- D. Beyond a point twice the focal length of the lens of the camera
Explanation
Placing the document at 2F gives a same-size (magnification =1) real inverted image, producing an exact copy.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.