In air a concave mirror has a focal length of 30. cm. Under water ...

[Zoey63294]

In air a concave mirror has a focal length of 30. cm. Under water that same mirror would have ________ focal length.
 
  A) a larger
  B) the same
  C) a smaller

Question 2

A parallel plate capacitor with plate separation of 4.0 cm has a plate area of 4.0  10-2 . What is the capacitance of this capacitor with air between these plates?
 
  A) 8.9  10-11 F
  B) 8.9  10-12 F
  C) 8.9  10-13 F
  D) 8.9  10-14 F
  E) 8.9  10-15 F

[raili21]

Answer to Question 1

B

Answer to Question 2

B

[Zoey63294]

Thanks for the timely response, appreciate it

[aliotak]

Excellent