1.

A zone plate of focal length \[60\,cm,\] behaves as a convex lens, If wavelength of incident light is \[6000\,\,{AA},\] then radius of first half period zone will be                                                     [RPMT 2001]

A. \[36\times {{10}^{-8}}m.\]     
B. \[6\times {{10}^{-8}}m.\]
C. \[\sqrt{6}\times {{10}^{-8}}m.\]                                      
D. \[6\times {{10}^{-4}}m.\]
Answer» E.


Discussion

No Comment Found

Related MCQs