Question 31
A lantern gives an image of 3m square of a slide 7.62cm square on a screen. If the screen is 10m from the projection lens of the lantern, calculate the focal length of the lens
Objective
Question details
- Exam body
- WAEC
- Subject
- Physics
- Year
- 1998
- Question no.
- #31
- Type
- Objective
More from this paper
- Q27What is the image distance of an object placed at a distance of 2f from a…
- Q28The images formed by diverging lenses are always
- Q29A converging lens of focal length 5cm is used as a magnifying glass by a man…
- Q33the shortest length of the air column in a resonance tube at resonance is 0.12m…
- Q34A sonometer wire under a tension of N10N, produces a frequency of 250Hz when…
- Q35Calculate he wavelength of a note which is one octave lower than a note of 256Hz…