1. What is meant by apparent depth or optical depth? Write an expression for it.
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Answer:Apparent depth and real depth - definition
Real Depth is actual distance of an object beneath the surface, as would be measured by submerging a perfect ruler along with it. Apparent depth in a medium is the depth of an object in a denser medium as seen from the rarer medium. Its value is smaller than the real depth.
Δs=h(1-1/υ)
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Answer:Apparent depth and real depth - definition
Real Depth is actual distance of an object beneath the surface, as would be measured by submerging a perfect ruler along with it. Apparent depth in a medium is the depth of an object in a denser medium as seen from the rarer medium. Its value is smaller than the real depth.
Δs=h(1-1/υ)
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