A telescope of aperture 3x10^-2 m diameter is focused on a window at 80 m distance fitted with a wire - Physics - Ray Optics and Optical Instruments

Question

A telescope of aperture 3x10^-2 m diameter is focused on a window
at 80 m distance fitted with a wire mesh of spacing 2x10^-3 m
​Given lamda= 5 5x10^-7 m, which is true:
​a) Yes possible with same aperture size
b) no, not possible
​c) possible also when aperture half of present diameter
​d) Data not sufficient

Rajnish Kumar · Accepted Answer

Dear student
using formula ∆θ=1 22λa×spacing=1
22×5 5×10-73×10-2×80 =178
93×10-5which is too smaller as compared to resulation given in question hence it is not possible
Regards