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When light passes from a denser medium (water) to a rarer medium (air) , it bends away from the normal , making the object appear closer to the surface than it actually is. This is why a submerged object (like a fish) appears at a shallower depth to an observer in air. This phenomenon leads to the concept of apparent depth , given by: 
Where: • d = real depth • μ = refractive index of water relative to air (>1) Since μ > 1, it follows that: Apparent depth < d Therefore, correct answer is option (c).
It will cruise in the atmosphere like an aircraft and it has capable of travelling up to 1,000 km.
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