12) Suppose the upper of the two plates in the figure below is made of a plastic material with n = 1, 40 the wedge is filled with a silicone grease having n = 1.5 and the bottom plate is of a dense flint glass with n = 1.6 Which of the following statement is true? lambda_{0} = 500nm Silicone grease n = 1.5 Plastic : n = 1.4 Flint glass n = 1.6; I = 10cm; h = 0.02mm There is half-cycle phase shift only at the surface between the silicone grease and the dense flint glass There is half - cycle phase shift at both the surface between the plastic material and the silicone grease and between the silicone grease and the dense flint glass . There is half -cycle phase shift only at the surface between the plastic material and the silicone grease There is no phase shift at either the surface between the plastic material or the silicone grease and between the silicone grease and the dense flint glass There is quarter cycle phase shift at the surface between the plastic material and the

12) Suppose the upper of the two plates in the figure below is made of a plastic material with n = 1, 40 the wedge is filled with a silicone grease having n = 1.5 and the bottom plate is of a dense flint glass with n = 1.6 Which of the following statement is true? lambda_{0} = 500nm Silicone grease n = 1.5 Plastic : n = 1.4 Flint glass n = 1.6; I = 10cm; h = 0.02mm There is half-cycle phase shift only at the surface between the silicone grease and the dense flint glass There is half - cycle phase shift at both the surface between the plastic material and the silicone grease and between the silicone grease and the dense flint glass . There is half -cycle phase shift only at the surface between the plastic material and the silicone grease There is no phase shift at either the surface between the plastic material or the silicone grease and between the silicone grease and the dense flint glass There is quarter cycle phase shift at the surface between the plastic material and the