Often when I read a book and see an image or picture, there's always something like "picture 1-a" or "1.a". Sometimes it's also written in the following form "Picture 1.10" or "Picture 1-10."
In my language, we usually simply read it in a way that can be translated into English as "Picture 1 a" for 1-a, and the same way for 1.a. When it comes with "10" examples, we read it like "Picture 1 dot 10" for 1.10, and "1 strip 10" for 1-10 (We call (-) as strip).
How is exactly the correct or commonly-practiced way to read those?