Nature of Physics
Object in rarer medium and observer in denser medium, app depth, real depth & Shift, Ray optics 12 class physics.
part -1 : https://youtu.be/YeJIB3sV5Rk
Source
part: 2 Object in rarer and observer in denser medium, app depth, real depth & Shift mains, advance.
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Both the video had a lot of stuff 👍👍👍👍