A nearsighted person cannot see objects beyond 80 cm from his ...

[Caiter2013]

A nearsighted person cannot see objects beyond 80 cm from his eyes.
 
  Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to comfortably see the distant objects clearly?
  A) +80 cm, -1.3 diopters
  B) -80 cm, +1.3 diopters
  C) +80 cm, +1.3 diopters
  D) -1.3 cm, +1.3 diopters
  E) -80 cm, -1.3 diopters

Question 2

A 500-N weight sits on the small piston of a hydraulic machine. The small piston has an area of 2.0 cm2. If the large piston has an area of 40 cm2, how much weight can the large piston support? Assume the pistons each have negligible weight.
 
  A) 25 N
  B) 500 N
  C) 10000 N
  D) 40000 N

[onowka]

Answer to Question 1

E

Answer to Question 2

C

[Caiter2013]

Thanks

[onowka]

Welcome