Lens question

[arc5005]

Myopia is a condition of the eye where the crystalline lens focuses the light rays to a position between the lens and the retina. To correct for this condition, a thins lens is placed in front of the eye that will help to focus light on the retina.

A. converging
B. diverging
C. spherical
D. cylindrical





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Answer: diverging.

Can anyone explain this to me please? I thought it would be a converging lens.

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[Altius Premier Tutor]

Take a look at the following image first for better understanding. Here

In normal vision, the light rays coming into your lens are focused onto your retina (your focal point is on your retina). With myopia, the focal point of the lens is in front of the retina resulting in near sightedness. Since you can't adjust the lens of your eye, you put on glasses with diverging lenses which will diverge the rays further before it hits the converging lens in your eye thus resulting in the image being formed on your retina rather than in front of your retina. If you are familiar with ray diagrams, try using ray diagrams to help you conceptualize this. Here is another good image to help.

Hope this explanation helps.

 

[arc5005]

Take a look at the following image first for better understanding. Here

In normal vision, the light rays coming into your lens are focused onto your retina (your focal point is on your retina). With myopia, the focal point of the lens is in front of the retina resulting in near sightedness. Since you can't adjust the lens of your eye, you put on glasses with diverging lenses which will diverge the rays further before it hits the converging lens in your eye thus resulting in the image being formed on your retina rather than in front of your retina. If you are familiar with ray diagrams, try using ray diagrams to help you conceptualize this. Here is another good image to help.

Hope this explanation helps.

thank you. this helps!