If white light is incident on this platelet which colour will be strongly reflected

Red

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Blue

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Green

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Solution

The correct option is C Green
For guanine layers
$2 t_{g} = (m + \frac{1}{2}) \frac{λ}{n_{g}}$
or
$λ = \frac{2 t_{g} n_{g}}{(m + \frac{1}{2})} = \frac{2 (74 (1.8))}{(m + \frac{1}{2})}$
or
$λ = 533 n m$
Similarly for cytoplasm layers
$2 t_{c} = (m + \frac{1}{2}) \frac{λ}{n_{c}}$
or
$λ = \frac{2 t_{c} n_{c}}{(m + \frac{1}{2})} = \frac{2 (100 (1.33))}{(m + \frac{1}{2})}$
or
$λ = 533 n m$
This corresponds to the green layer.

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If white light is incident on this platelet which colour will be strongly reflected

The correct option is C GreenFor guanine layers2tg=(m+12)λngorλ=2tgng(m+12)=2(74(1.8))(m+12)orλ=533nmSimilarly for cytoplasm layers2tc=(m+12)λncorλ=2tcnc(m+12)=2(100(1.33))(m+12)orλ=533nmThis corresponds to the green layer.