1) I did wudhu and was satisfied with it before prayers, but during prayers I felt there was some debris on the outside corner of my eye. I don’t know whether it was there during wudhu, is my wudhu valid and my prayer correct?
2) During prayers, can we say Alhamdulillah before saying the tashahhud?
3) During ruku, my legs tend to shake, and I often get imbalanced and can’t seem to remain straight and stable. How do I do my ruku then if I shake most of the time and become unstable? Is my ruku correct?
1. Your wudhu and salat are both correct.
2. It is acceptable to say Alhamdulillah as long as you do not consider it an obligatory part of the prayers.
3. Your ruku is correct if the shaking of your body is out of your control.