Therefore, the inequality ( K 2 ρ 2 ) 1/2 > ( K 1 ρ 1 ) 1/2 is held and the coefficient R can have quite significant value, which is enough to provide the visible reflection signal (see Figure 4 ).
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Therefore, the inequality ( K 2 ρ 2 ) 1/2 > ( K 1 ρ 1 ) 1/2 is held and the coefficient R can have quite significant value, which is enough to provide the visible reflection signal (see Figure 4 ).