Question

Is the formula Real depth/Apparent depth=μ valid if viewed from a position quite away from the normal?"

Answer 1

Answer:

no the formula is not valid

Answer 2

The formula Real depth/Apparent depth=μ is not valid if viewed from a position quite away from the normal.

Explanation:

• No.  Because the formula in its derivation is $\frac{\sin i}{\sin r}=\mu$ Was used and the angles I and r were kept very small, the approximation $\sin i \approx \tan i$, and $\sin r \approx \tan r$ have been taken.
• Such approximations do not hold good when viewed from a location very far from average Therefore the formula "True depth / Apparent depth = μ" does not apply.