Stuck on math in deriving an optics equation

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SUMMARY

The discussion focuses on deriving the formula for bright fringes in optics, specifically addressing the mathematical approximation of the expression (1+a)^(1/2) as 1+a/2 when a is much less than 1. The user provides examples with values of a (0.02 and 0.002) to illustrate the approximation's accuracy. The conversation emphasizes the importance of understanding this approximation in the context of optics equations.

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Puchinita5
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Homework Statement



Hi. For a project I have to derive this formula for bright fringes in optics, but I'm stuck on this simple math part (or maybe its not so simple)...ive attached a picture of where i don't understand...it might be considered a simple math problem so I'm sorry if this is too trivial a question for physics forums :)

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The Attempt at a Solution

 

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(1+a)1/2 can be approximated by 1+a/2 if a<<1.

For example:

a=0.02: 1.021/2=1.00995...~1.01,

a=0.002: 1.0021/2=1.0009995...~1.001

ehild
 

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