A(n) ______________ image cannot be focused on a screen. Fill in ...

[geodog55]

A(n) ______________ image cannot be focused on a screen.
 Fill in the blank(s) with correct word

Question 2

The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm?
 a. 7.7
  b. 16.6
  c. 6.6
  d. 3.2
  e. 19.2

[sailorcrescent]

Answer to Question 1

virtual

Answer to Question 2

c