By M. Rousseau, J.P. Mathieu and D. ter Haar (Auth.)

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Assume that the difference is small and derive the difference in ordinate by which separates two points close to M i on INTERFERENCE PROBLEM 9] 41 t h e plate for which the illumination is equal to half the maximum illumination under the assumption t h a t the reflection coefficients of Ρ and Q are such that the coefficient of fineness has the value Ν = 30. W h a t is the resolving power R' for this device near the wavelength λ 0 ? C o m p a r e this with the resolution of the grating spectrograph.

F o r what thickness R is it maximal? 30. 5. Indicate the advantages and disadvantages which occur for partially reflecting metal and dielectric films. 52 [PROBLEM 11 PROBLEMS IN OPTICS III In the case of normal incidence, equations (1) and (2) become r i J * \ \ ^ = - r μι V r (3) V μι Since ε = ε 0 ε Γ and μ = μ 0 μ Γ , if ετ = μ Γ, r = 0. 4). Realization of equation (3) at the surface of separation of two media is equivalent to the situation where the impedance is matched at the junction of two transmission lines.

These are parabolas (Fig. 9b) with vertices along the λ-axis coinciding with λ = 0. III. Large monochromatic source. Rings at infinity 1. One observes fringes of equal inclination localized at infinity. 2. If ι is the angle of incidence of the rays on mirrors Mi and M 2 , the path difference between the reflected rays is 1 b = 2ecosi (5) = 2e(\- -^. The centre appears as a bright point. The interference order on the axis is an integer k0. The bright rings are produced by rays making the angle i with the axis such that ι = yjk^k (k integer).

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