Calculate Fresnel distance for aperture of 1mm using Red light of wavelength 7000Å.

Explanation

To calculate the Fresnel distance for an aperture of 1 mm using red light of wavelength 7000 Å, we will follow these steps:

### Step 1: Understand the Formula for Fresnel Distance
The Fresnel distance \( F_z \) can be calculated using the formula:
\[ F_z = \frac{a^2}{\lambda} \]
where:
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