Font size of text within image/graph for MS Thesis Can somebody suggest what should be the optimal font size of text like axis ticks, axis label, legend etc. ?
Your institution's thesis template may specify this - some do and some don't.
If not then it's really up to you.  Typically, you want it to be smaller than your main text so that it doesn't stand out inappropriately much.  Beyond that, it's a  balance for efficacy of communication: larger sizes are more legible, but smaller sizes can help avoid visual clutter.  Remember also that many of your readers may be older or have imperfect vision and have a hard time with smaller fonts.