muskan

Optics

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muskan    1

We know that concave lens forms a virtual and erect image. But when we wear a concave lens to correct myopia, we don't see a virtual image. Image is formed in the retina and is real and inverted. why?

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Klaynos    724

We don't answer questions directly here, but give help. Let me ask you two questions...

How have you tried to answer this so far?

Have you drawn a ray diagram of the situation?

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muskan    1

The rays that are diverged from a concave lens, appear to meet at a point. The same rays meet at retina after refraction by a convex lens. Then, the brain makes us able to see the object. Then, why don't we see two images?

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swansont    6251
2 hours ago, muskan said:

The rays that are diverged from a concave lens, appear to meet at a point. The same rays meet at retina after refraction by a convex lens. Then, the brain makes us able to see the object. Then, why don't we see two images?

If you are correcting myopia, are you relying on the concave lens to form an image all by itself?

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Endy0816    348

This might help:

1447210424.jpg

Like Swansont is suggesting need to consider the convex lens and cornea of the eye.

If you have a magnifying glass or a farsighted friend, you can see the image flip for yourself.

 

  • Upvote 2

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Klaynos    724
10 hours ago, Endy0816 said:

This might help:

1447210424.jpg

Like Swansont is suggesting need to consider the convex lens and cornea of the eye.

If you have a magnifying glass or a farsighted friend, you can see the image flip for yourself.

 

Good diagram. Demonstrates exactly why drawing a ray diagram as the first step would have helped op. 

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studiot    1190
50 minutes ago, Klaynos said:

Good diagram. Demonstrates exactly why drawing a ray diagram as the first step would have helped op. 

Yes I like it too. +1 to Endy

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Endy0816    348

Thanks guys.

Yeah, not the easiest thing to put into words. Sometimes just need to see what the light itself is doing.

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