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Changing reversing light on a focus?

When light passes through a lens, does it bend (refract)?

  • this is grade 10 science, on eyes and such, i also had other questions what two structures are responsible for foccussing light on the retina? define the term refraction distinguish between the terms "reflection" and refraction" of light rays what change in lens shape occurs when changing focus from a near to a far away object? as you age, what may cause a reduction in the ability of the lens to accommodate? a person is able to cleary see only far away objects. what disorder does he or she have? how can this disorder be corrected why is your ability to focus clearly impaired when you first wake up what shape does the lens take while you are sleeping? plzzz help me on this,,,thnk uuu soo much :) :)

  • Answer:

    This is pretty advanced stuff for grade 10. 1) The cornea and lens focus light to the retina. The cornea actually has the greater optical power. 2) Refraction is the change in direction of propagation that occurs when light crosses an interface between two media of different refractive index. Yes, this is what happens when light passes through a lens. 3) Reflection is when light incident on an interface between two media of different refractive index is redirected back into its original medium. For example, when light hits the interface between the air and your polished mirror, it is mostly reflected back into the air. 4) To see far away, the lens is compressed. It becomes thinner and flatter. 5) As you age, the lens becomes thicker and less elastic. This prevents it from changing shape, even though the ciliary muscle still works. 6) Hyperopia 7) They need a positive prescription. 8) Not sure. Possibly, because your tear film has dried. Also, you're fully dark adapted when you wake up. And, your cornea may have taken an odd shape if you were sleeping on your face. 9) I would guess the relaxed state, which is focused for distance.

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(i)when light passes through lens it refracts but when you go upto my level you will learn that it will deviate as it acts like a small angle and hence it also disperses light. (ii)iris and ciliary muscles (iii)mediums like water,kerosene,glass donot reflect light but the light passes through them. this behavior of passing through the medium is refraction. (iv)you get that from (iii) (v)the rays are coming from far so the lens become of less aperture. (vi)the ciliary muscles has less efficiency to contract or expand as you grow older so.. (vii)this is hypermetropia (viii)a concave lens is needed as the light rays intersect closer

shisir

This is pretty advanced stuff for grade 10. 1) The cornea and lens focus light to the retina. The cornea actually has the greater optical power. 2) Refraction is the change in direction of propagation that occurs when light crosses an interface between two media of different refractive index. Yes, this is what happens when light passes through a lens. 3) Reflection is when light incident on an interface between two media of different refractive index is redirected back into its original medium. For example, when light hits the interface between the air and your polished mirror, it is mostly reflected back into the air. 4) To see far away, the lens is compressed. It becomes thinner and flatter. 5) As you age, the lens becomes thicker and less elastic. This prevents it from changing shape, even though the ciliary muscle still works. 6) Hyperopia 7) They need a positive prescription. 8) Not sure. Possibly, because your tear film has dried. Also, you're fully dark adapted when you wake up. And, your cornea may have taken an odd shape if you were sleeping on your face. 9) I would guess the relaxed state, which is focused for distance.

B

(i)when light passes through lens it refracts but when you go upto my level you will learn that it will deviate as it acts like a small angle and hence it also disperses light. (ii)iris and ciliary muscles (iii)mediums like water,kerosene,glass donot reflect light but the light passes through them. this behavior of passing through the medium is refraction. (iv)you get that from (iii) (v)the rays are coming from far so the lens become of less aperture. (vi)the ciliary muscles has less efficiency to contract or expand as you grow older so.. (vii)this is hypermetropia (viii)a concave lens is needed as the light rays intersect closer

shisir

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