A slit of width 0.010 mm has light of frequency 5.0 1014 Hz ...

[plus1]

A slit of width 0.010 mm has light of frequency 5.0  1014 Hz passing through it onto a screen 60 cm away. How wide is the central maximum? (c = 3.00  108 m/s)
 
  A) 1.8 cm B) 0.12 cm C) 3.6 cm D) 7.2 cm E) 0.90 cm

Question 2

For an eye that is 2.4 cm in diameter, what must be the range of focal lengths of the lens to focus objects from the near point (25 cm) to infinity on the retina?
 
  What will be an ideal response?

[scottmt]

Answer to Question 1

D

Answer to Question 2

2.2 cm  f  2.4 cm

[plus1]

Excellent

[recede]

Thanks for the timely response, appreciate it