In which direction will the sun appear to set if the observe is inside the water of a pond? Refractive index of water , `mu = 1.33.`

Explanation

For a setting sun the incident rays graze along the surface of water i.e. angle of incidence = `90^(@)`.
`therefore "According in Snell.s law",`
`mu_(w) = (sini)/(sinr) or, 1.33 = (sin90^(@))/(sinr)`
`or, " " sinr = (1)/(1.33) or, 1.33 = sin48.75^(@)`
`therefore " " r = 48.75^(@)`
Therefore, to see the setting sun the observe in water should look at an angle of `48.75^(@)` with the normal.