INTRODUCTION: I am having problems solving Some Optics MCQs recently. THE PROBLEMS : (1) T is a point at the bottom of a tank filled with water, as shown in the diagram. The refractive index of water is 4/3.YPT is the vertical line through T.To an observer at the position O, T will appear to be:(multiple options may be correct) (i)To the left of YT. (ii)Somewhere on YT. (iii)At a depth 3m below T. (iv)At a depth <3m below T. DIAGRAM IN WORDS: In case the diagram is not visible, the point O is directly above the right edge of the tank and the point T is somewhere at the middle of the bottom of the tank. WHAT I KNOW: The position of the apparent image will change with the angle of viewing. So, we can leave out option (ii). I think option (i) has to be correct. WHAT I CANNOT UNDERSTAND: But I'm cant make out what options (iii) and (iv) really want to say. Which of them is correct (if at all)? And why? I really dont understand why an image will be formed "below" T? We are viewing it from a rarer medium and the point T is in water (denser medium). Then why is the term "below T" give in the options (iii) and (iv)? CONCLUSION: I know i shouldn't have posted so many questions all at a time, but any help will be appreciated. Thanks a lot.