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An under-water swimmer cannot see very clearly even in absolutely clear water because of
- a)absorption of light in water
- b)scattering of light in water
- c)reduction of speed of light in water
- d)change in the focal length of eye lens
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
An under-water swimmer cannot see very clearly even in absolutely clea...
The eye lens is surrounded by a different medium than air. This will change the focal length of the eye lens. The eye cannot accommodate all images as it would do in air.
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An under-water swimmer cannot see very clearly even in absolutely clea...
Absorption of Light in Water
- Absorption of light in water refers to the process where light energy is absorbed by water molecules.
- This absorption process reduces the intensity of light as it travels through water.
- However, the absorption of light in water is not the primary reason why an underwater swimmer cannot see clearly.
Scattering of Light in Water
- Scattering of light in water occurs when light interacts with particles or molecules in the water, causing it to change direction.
- This scattering process can cause the light to scatter in multiple directions, making it difficult for the swimmer to see objects clearly.
- While scattering does contribute to reduced visibility underwater, it is not the main reason for the swimmer's unclear vision.
Reduction of Speed of Light in Water
- When light travels from one medium to another, such as from air to water, its speed changes.
- In the case of light entering water, its speed decreases.
- This change in speed can cause the light rays to bend or refract, which can affect the swimmer's ability to see clearly.
- However, the reduction of speed of light in water is not the primary reason for the swimmer's unclear vision.
Change in the Focal Length of Eye Lens
- The main reason why an underwater swimmer cannot see clearly is due to the change in the focal length of the eye lens.
- When light enters the eye, it passes through the cornea, the aqueous humor, and finally the lens before reaching the retina.
- The lens of the eye adjusts its shape to focus the incoming light onto the retina, forming a clear image.
- However, when the eye is submerged in water, the refractive index of the water is different from the refractive index of the eye's lens.
- This difference in refractive index causes the lens to lose its ability to focus light properly, resulting in a blurred vision for the swimmer.
- The swimmer's eye is essentially trying to focus light as if it were in air, but the presence of water changes the conditions and leads to a compromised focus.
- Therefore, the change in the focal length of the eye lens is the primary reason why an underwater swimmer cannot see clearly.
- Absorption of light in water refers to the process where light energy is absorbed by water molecules.
- This absorption process reduces the intensity of light as it travels through water.
- However, the absorption of light in water is not the primary reason why an underwater swimmer cannot see clearly.
Scattering of Light in Water
- Scattering of light in water occurs when light interacts with particles or molecules in the water, causing it to change direction.
- This scattering process can cause the light to scatter in multiple directions, making it difficult for the swimmer to see objects clearly.
- While scattering does contribute to reduced visibility underwater, it is not the main reason for the swimmer's unclear vision.
Reduction of Speed of Light in Water
- When light travels from one medium to another, such as from air to water, its speed changes.
- In the case of light entering water, its speed decreases.
- This change in speed can cause the light rays to bend or refract, which can affect the swimmer's ability to see clearly.
- However, the reduction of speed of light in water is not the primary reason for the swimmer's unclear vision.
Change in the Focal Length of Eye Lens
- The main reason why an underwater swimmer cannot see clearly is due to the change in the focal length of the eye lens.
- When light enters the eye, it passes through the cornea, the aqueous humor, and finally the lens before reaching the retina.
- The lens of the eye adjusts its shape to focus the incoming light onto the retina, forming a clear image.
- However, when the eye is submerged in water, the refractive index of the water is different from the refractive index of the eye's lens.
- This difference in refractive index causes the lens to lose its ability to focus light properly, resulting in a blurred vision for the swimmer.
- The swimmer's eye is essentially trying to focus light as if it were in air, but the presence of water changes the conditions and leads to a compromised focus.
- Therefore, the change in the focal length of the eye lens is the primary reason why an underwater swimmer cannot see clearly.
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An under-water swimmer cannot see very clearly even in absolutely clear water because ofa)absorption of light in waterb)scattering of light in waterc)reduction of speed of light in waterd)change in the focal length of eye lensCorrect answer is option 'D'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about An under-water swimmer cannot see very clearly even in absolutely clear water because ofa)absorption of light in waterb)scattering of light in waterc)reduction of speed of light in waterd)change in the focal length of eye lensCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An under-water swimmer cannot see very clearly even in absolutely clear water because ofa)absorption of light in waterb)scattering of light in waterc)reduction of speed of light in waterd)change in the focal length of eye lensCorrect answer is option 'D'. Can you explain this answer?.
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