A 4.0 cm tall object is placed 50 cm away from a converging lens ...

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A 4.0 cm tall object is placed 50 cm away from a converging lens of focal length 25 cm. What is the nature and location of the image?
 
  A) The image is real, 2.5 cm tall, 25 cm on the same side as object.
  B) The image is virtual, 2.5 cm tall, 25 cm on the other side of the lens.
  C) The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens.
  D) The image is virtual, 4.0 cm tall, 50 cm on the same side as object.
  E) The image is real, 4.0 cm tall, 50 cm on the other side of the lens.

Question 2

Two spaceships approach each other along a straight line at a constant velocity of 0.988c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.900c.
 
  From the point of view of the observer on Earth, what is the speed of the other ship?

[kxciann]

Answer to Question 1

E

Answer to Question 2

0.794c