A microscope has an objective lens of focal length 1.40 mm and an ...

[elizabeth18]

A microscope has an objective lens of focal length 1.40 mm and an eyepiece of focal length 20.00 mm. It is adjusted for minimum eyestrain for persons with a near point of 25.0 cm. A blood sample is placed 1.50 mm from the objective.
 
  How far apart are the lenses? A) 20 mm
  B) 21 mm
  C) 23 mm
  D) 41 mm

Question 2

A tracking station on Earth observes a rocket move away at 0.370c. This rocket is designed to launch a projectile at 0.505c relative to the rocket.
 
  What speed (in terms of the speed of light) does the tracking station measure for the projectile if it is fired (a) straight ahead of the rocket or (b) backward from the rocket?

[honnalora]

Answer to Question 1

D

Answer to Question 2

(a) 0.737c (b) 0.166c

[elizabeth18]

Gracias!

[robbielu01]

Excellent