TS EAMCET · Physics · Ray Optics
An empty tank has concave mirror as its bottom. When sunlight falls normally on the mirror, it is focussed at a height of \(32 \mathrm{~cm}\) from the mirror. If the tank is filled with water upto a height of \(20 \mathrm{~cm}\), then the sunlight focusses at (refractive index of water \(=\frac{4}{3}\) )
- A \(16 \mathrm{~cm}\) above water level
- B \(9 \mathrm{~cm}\) above water level
- C \(16 \mathrm{~cm}\) below water level
- D \(9 \mathrm{~cm}\) below water level
Answer & Solution
Correct Answer
(B) \(9 \mathrm{~cm}\) above water level
Step-by-step Solution
Detailed explanation
Sun at infinity, \(u=\infty\) Focussed at a height, \(\mathrm{v}=-32 \mathrm{~cm}\) Refractive index of water, \(\mu_{\mathrm{w}}=\frac{4}{3}\) From the mirror formula…
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