I am writing to seek clarification on a technical matter related to the article How to build a spectrometer - theory.
Thanks to your guidance, I was able to successfully reproduce the spectrometer.
However, I now have a question regarding the consideration of the entrance slit size and its impact on the resulting image or spectral bandwidth.
Specifically, I would like to simulate how different entrance slit sizes, such as 10µm or 100µm, affect the performance of the spectrometer.
Despite my attempts to manipulate the aperture settings, I have been unable to create a slit in the simulation.
![](https://uploads-us-west-2.insided.com/zemax-en/attachment/96e246a9-41b4-4a93-8de9-ad0607fbf4e1.png)
I kindly request your guidance on how to properly take the entrance slit size into consideration during the spectrometer simulation.
Could you please provide me with detailed instructions or suggestions on how to achieve this?