Niki Papachristou
Ansys Employee

Hi Uzma,

Thank you for reaching out to us. The Airy disk is calcutlated using the primary wavelength. You can check your primary wavelength under your System Explorer settings. Additionally, an alternative to calculate the Airy disk on a diffent wavelength would be under the spot diagram settings/ wavelength:

I hope that was helpful, let me know if I can be of further assistance.

Kind Regards,