A slide projector is designed with its lens 6.0 m from the ...

[BrownTown3]

A slide projector is designed with its lens 6.0 m from the screen. The projected image is 1.5 m square of a slide object 2.5 cm square.
 
  (a) What is the object distance from the lens?
  (b) What should be the lens focal length?
  (c) What is the lens POWER?

Question 2

Mary builds a simple magnifying telescope using two lenses of focal length 80. cm and 5.0 cm. The respective diameters are 60. mm and 10. mm.
 
  How many degrees wide does the moon appear through the telescope if it appears only 1/2 degree wide with the naked eye?

[miss_1456@hotmail.com]

Answer to Question 1

(a) 10. cm
(b) f = 9.8 cm
(c) 10.2 Diopters

Answer to Question 2

8 degrees wide (16 times larger)

[BrownTown3]

Thanks

[miss_1456@hotmail.com]

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