MHT CET 2026 Physics question
Converging lens of telescope 5 cm in diameter has focal length 25 cm. In the focal plane of the lens the distance between the centres of the Fraunhofer diffraction pattern is (wavelength of light used = 5000 , Rayleigh's criterion is satisfied)
Answer: (C)
Solution
By Rayleigh's criterion for a circular aperture of diameter , the limit of resolution (angular separation of the centres of the two diffraction patterns) is . In the focal plane of a lens of focal length , the linear separation is \dfrac${1.22λ
See the full step-by-step solution
Create a free account to read the complete working, and practise questions like this in a timed test.
Create a free account