3. Determine the Cardinal points of a Huygens eye piece having 20 cm séparation between two lenses.
10. Two coherent sources of intensity 10 w/mʼand 40 w/m² interfere to from fringe pattern. Find the
ratio of maximum intensity to minimum intensity.
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In Huygen's eye piece the cross wires are not present.
It satisfies condition of achromation and codition for mininum spherical aberrations. In Huygen's eye-piece image formed by the objective is a real image.
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