An illumination slide is held 44 cm from a screen. In order to have an image of

Question

An illumination slide is held 44 cm from a screen. In order to have an image of the slide's picture on the screen three times the size of the picture, how far from the slide must a converging lens be placed and what focal length it should have? _The answer is __
11 cm and 8.25 cm. How do you get this?
An illumination slide is held 44 cm from a screen. In order to have an image of the slide's picture on the screen three times the size of the picture, how far from the slide must a converging lens be placed and what focal length it should have? _The answer is __
11 cm and 8.25 cm. How do you get this?
11 cm and 8.25 cm. How do you get this?

Explanation / Answer

let the distance be x.so,

3=v/u

or v=3x.so,

3x+x=44

or x=11

so it should be at a distance of 11 cm

or (1/x)+(1/3x)=1/f

or f=8.25 cm

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.