A Film of Index of Refraction N₁ Coats a Surface $\lambda$

question 63

Multiple Choice

A film of index of refraction n₁ coats a surface with index of refraction n₂.When n₁ < n₂,the condition for constructive interference for reflected monochromatic light of wavelength $\lambda$ in air is

• A) \(t = m \frac { \lambda } { n _ { 1 } }\) .
• B) \(t = \left( m + \frac { 1 } { 2 } \right) \frac { \lambda } { n _ { 1 } }\) .
• C) \(2 t = m \frac { \lambda } { n _ { 1 } }\) .
• D) \(2 t = \left( m + \frac { 1 } { 2 } \right) \frac { \lambda } { n _ { 1 } }\) .
• E) \(4 t = m \frac { \lambda } { n _ { 1 } }\) .

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