Author Question: A person's eye lens is 2.7 cm away from the retina. (a) What must the focal length of this lens ... (Read 86 times)

tfester · **on:** Jul 29, 2018

A person's eye lens is 2.7 cm away from the retina.

(a) What must the focal length of this lens be in order for an object placed at the near point (N = 25.0 cm) of the eye to focus on the retina?
(b) What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?

Question 2

A Carnot cycle engine operates between a low temperature reservoir at 20C and a high temperature reservoir at 800C. If the engine is required to output 20.0 kJ of work per cycle,

how much heat must the high temperature reservoir transfer to the engine during each cycle?
A)

27.5 kJ

B)

73.2 kJ

C)

39.2 kJ

D)

800 kJ

E)

20.5 kJ