Which of the following formulae is incorrect in a bi-prism?

d = \sqrt{d_{1} d_{2}}

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d = 2 a (μ - 1) a

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d = \frac{D λ}{β}

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d = \sqrt{\frac{d_{1}^{2}}{d_{2}}}

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Solution

The correct option is D $d = \sqrt{\frac{d_{1}^{2}}{d_{2}}}$
If $d_{1}$ , $d_{2}$ are the distances of two virtual sources from the central axis, the average $d$ is given by
$d = \sqrt{d_{1} d_{2}}$ .

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Which of the following formulae is incorrect in a bi-prism?

The correct option is D d=√d21d2If d1, d2 are the distances of two virtual sources from the central axis, the average d is given by d=√d1d2.

The correct option is D $d = \sqrt{\frac{d_{1}^{2}}{d_{2}}}$
If $d_{1}$ , $d_{2}$ are the distances of two virtual sources from the central axis, the average $d$ is given by
$d = \sqrt{d_{1} d_{2}}$ .