To a swimmer under water, objects lookblurred and out of focus. However, when th

Question

To a swimmer under water, objects lookblurred and out of focus. However, when the swimmer wears gogglesthat keep the water away from the eyes, the objects appear sharpand in focus. Why do goggles improve a swimmer's underwatervision?

1 Water isa dispersive medium and different wavelengths of the incoming lightare focused by the optical system of the eye at differentlocations. This makes the image blurred when viewed in theunderwater world. That dispersion does not take place when theincident medium is air.
Thewater against the exposed eye is cold, and the lower temperature ofthat water environment makes the cornea and lens far less flexibleand controllable in terms of achieving a clear image of an objectobserved under water. Goggles help keep the eye and its interiorcomponents warm and flexible.

Water isnot particularly transparent and since so little light gets intothe eyes when a person is observing underwater, the world thereseems blurred. Goggles reduce substantially the transparencyproblem.
Withoutthe goggles the incident medium for the swimmer observingunderwater is water whose "n" value is not much different from thecornea and the materials inside it. Consequently, the initialrefraction at the cornea leads to an angle of refraction not muchdifferent than the angle of incidence. However, when the medium infront of the eye is air as it would be when the swimmer wearsgoggles, the deviation of the refracted ray is far greater, enoughto produce clear and distinct images on the eye'sretina.
1 Water isa dispersive medium and different wavelengths of the incoming lightare focused by the optical system of the eye at differentlocations. This makes the image blurred when viewed in theunderwater world. That dispersion does not take place when theincident medium is air.
Thewater against the exposed eye is cold, and the lower temperature ofthat water environment makes the cornea and lens far less flexibleand controllable in terms of achieving a clear image of an objectobserved under water. Goggles help keep the eye and its interiorcomponents warm and flexible.

Water isnot particularly transparent and since so little light gets intothe eyes when a person is observing underwater, the world thereseems blurred. Goggles reduce substantially the transparencyproblem.
Withoutthe goggles the incident medium for the swimmer observingunderwater is water whose "n" value is not much different from thecornea and the materials inside it. Consequently, the initialrefraction at the cornea leads to an angle of refraction not muchdifferent than the angle of incidence. However, when the medium infront of the eye is air as it would be when the swimmer wearsgoggles, the deviation of the refracted ray is far greater, enoughto produce clear and distinct images on the eye'sretina.
1 Water isa dispersive medium and different wavelengths of the incoming lightare focused by the optical system of the eye at differentlocations. This makes the image blurred when viewed in theunderwater world. That dispersion does not take place when theincident medium is air.
Thewater against the exposed eye is cold, and the lower temperature ofthat water environment makes the cornea and lens far less flexibleand controllable in terms of achieving a clear image of an objectobserved under water. Goggles help keep the eye and its interiorcomponents warm and flexible.

Water isnot particularly transparent and since so little light gets intothe eyes when a person is observing underwater, the world thereseems blurred. Goggles reduce substantially the transparencyproblem.
Withoutthe goggles the incident medium for the swimmer observingunderwater is water whose "n" value is not much different from thecornea and the materials inside it. Consequently, the initialrefraction at the cornea leads to an angle of refraction not muchdifferent than the angle of incidence. However, when the medium infront of the eye is air as it would be when the swimmer wearsgoggles, the deviation of the refracted ray is far greater, enoughto produce clear and distinct images on the eye'sretina.
1

Explanation / Answer

To a swimmer under water, objects look blurred and out of focus.However, when the swimmer wears goggles that keep the water awayfrom the eyes, the objects appear sharp and in focus. Why dogoggles improve a swimmer's underwater vision? options B and D are correct.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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