Find the acceptance angle of a material which has a numerical aperture of 0.707 in air. Select one: a. 90 b. 30 c. 60 d. 45
Question
Find the acceptance angle of a material which has a numerical aperture of 0.707 in air.
Select one: a. 90 b. 30 c. 60 d. 45
Solution
The acceptance angle (θ) of a material can be found using the formula:
θ = arcsin(NA)
where NA is the numerical aperture.
Given that the numerical aperture (NA) is 0.707, we can substitute this into the formula:
θ = arcsin(0.707)
Using a calculator, the arcsin(0.707) is approximately 45 degrees.
So, the correct answer is:
d. 45
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