Which approximation was made when deriving the formula for finding bright spots? a. tan(x) roughly equal...

Question

Question

Which approximation was made when deriving the formula for finding bright spots?

a. tan(x) roughly equal to sin(x)

b. tan(x) roughly equal to cos(x)

c. sin(x) roughly equal to x

d. cos(x) roughly equal to x

Answer 1

Answer #1

For determining the formula for bright spot the angle is very small so that for very small angle we can take

Sin(theta)~ theta

And

tan(theta)~theta

So we take for determining the formula

Sin(theta)~tan(theta)

So correct option is: option 'a'

Answer 2

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