MCQ

Share

Two closely-spaced distant stars are just resolved when seen through a telescope with an objective lens of diameter $D$ and focal length $f$. The separation between their images is given by.

• A
  $\frac{D}{1.22 \lambda f}$
  
• B
  $\frac{f D }{1.22 \lambda}$
  
• ✓
  $\frac{1.22 \lambda f}{D}$
  
• D
  $\frac{1.22 D \lambda}{f}$