First slide

Coherent sources and their importance in interference

Question

Calculate the minimum thickness of the film $(μ = 1.4)$ in which interference of violet component $(λ = 400 n m)$ of incident light can take place by reflection.

Moderate

A

$7143 \overset{0}{A}$
B

$7.143 \overset{0}{A}$
C

$71.43 \overset{0}{A}$
D

$714.3 \overset{0}{A}$

Solution

$F o r c o n s t r u c t i v e i n t e r f e r e n c e, 2 μ t = (2 m + 1) \frac{λ}{2}, m = 0, 1, 2.......... ∴ t_{\min} = \frac{λ}{4 μ} = \frac{400 \times 10^{- 9}}{4 \times 1.4} = 714.3 \overset{0}{A}$

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