a fish looking up towards the air-water boundary in its tank sees the total refl

Question

a fish looking up towards the air-water boundary in its tank sees the total reflection of some object on the bottom of the tank. With what angle could the fish be looking up with respect to the normal to the waters surface (n=1.33 for water)?
ANS! 50 degrees a fish looking up towards the air-water boundary in its tank sees the total reflection of some object on the bottom of the tank. With what angle could the fish be looking up with respect to the normal to the waters surface (n=1.33 for water)?
ANS! 50 degrees a fish looking up towards the air-water boundary in its tank sees the total reflection of some object on the bottom of the tank. With what angle could the fish be looking up with respect to the normal to the waters surface (n=1.33 for water)?
ANS! 50 degrees a fish looking up towards the air-water boundary in its tank sees the total reflection of some object on the bottom of the tank. With what angle could the fish be looking up with respect to the normal to the waters surface (n=1.33 for water)?
ANS! 50 degrees a fish looking up towards the air-water boundary in its tank sees the total reflection of some object on the bottom of the tank. With what angle could the fish be looking up with respect to the normal to the waters surface (n=1.33 for water)?
ANS! 50 degrees

Explanation / Answer

Refractive index of water ni = 1.33
Refractive index of air nr = 1
crit is known as the critical angle.

The angle of incidence for the light ray should be greater than the critical angle for total Internal reflection.

Calculating crit for the Water air Boundary.

sin(crit) = nr/ni
sin(crit) = 1/1.33
crit = sin^-1 (1/1.33)
crit = 48.75

For Total Internal reflection, Fish should be looking up at an angle Greater than Critical Angle ie angle should be > 48.750

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.