PP2010P1Q23 and SP2014P1Q11 - Identifying what lens, focal length and image from 2 rays

These two questions are actually the same. Q23 is from 2010 Pure Physics P1 while Q11 is from 2014 Sci Physics P1. Take a look at these 2 questions. If you are not sure, view the video below for the explanation.

Answer to Q23: Option A

Answer to Q11: Option D

If you do not know how to answer these 2 questions, view this video and also refer to the lens summary below.