What are 2 characteristics of more divergence?

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Multiple Choice

What are 2 characteristics of more divergence?

Explanation:
More divergence comes from diffraction, which depends on the wavelength relative to the size of the emitting aperture. The beam’s spread in the far field is roughly proportional to the wavelength divided by the aperture diameter (λ/D). That means: if the diameter is smaller, diffraction increases and the beam spreads more; if the frequency is lower, the wavelength is longer, which also increases diffraction and spread. So the two characteristics that lead to more divergence are a smaller diameter and a lower frequency. Conversely, increasing diameter or increasing frequency (shorter wavelength) makes the beam less divergent.

More divergence comes from diffraction, which depends on the wavelength relative to the size of the emitting aperture. The beam’s spread in the far field is roughly proportional to the wavelength divided by the aperture diameter (λ/D). That means: if the diameter is smaller, diffraction increases and the beam spreads more; if the frequency is lower, the wavelength is longer, which also increases diffraction and spread. So the two characteristics that lead to more divergence are a smaller diameter and a lower frequency. Conversely, increasing diameter or increasing frequency (shorter wavelength) makes the beam less divergent.

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