virtual images can't be caught on screen. but how is it they can fall on retina?

Question

eg. the images seen through a micra scope

Answer 1

You know well that virtual images cannot be caught on a screen.

In a plane mirror the images are formed at the back of the mirror.

The rays from the real objects are falling on the mirror and are reflected by the mirror. The reflected rays are diverging rays. If you keep a screen so that the reflected rays are made to fall on it, no image can be formed.

Now keep a convex lens (Reading lens) in front of the mirror and adjust the screen or lens;
you can form a small inverted image of the virtual image (which is behind the mirror) on the screen.

Same thing happens in our eye. Our eye lens forms a real image of the virtual image which cannot be caught on a screen.

Answer 2

Rays from virtual images are divergent and they do never interesect to form any real image. And therefore thay can not be focused on screen.
Rays from actual objects (that you may call source) are also divergent and can not be focused on screen until u use some lens etc to focus them on screen.
Our ratina can see both the actual objects and virtual images. In case of virtual images, divergent rays appear to be coming from the virtual image.(remember u always back traced the rays to get the virtual images).
Now how can we see real images then! As the rays are convergentand the really do intersect to form an image. The answer is simpler than the question... Actually we see the real images only after they have converged to a real image and are now diverging. So the real image is always formed betwen the lens(or mirror) and eyes and virtual image is always formed behind the lens(or mirror).
I hope i was simple enough to explain, but in case... ping me again...
bye! n keep on learning

Answer 3

Virtual image in convex lens is formed when the object is place in between the centre of the lens and the focus.In the eye the curvature of the lens is adjusted by the muscles holding the lens to accomodate the image on the retina.

Answer 4

our eye lens(convex) converges the diverging rays on the retina and we see the image.

But on a screen the diverging rays fall and so no image is formed.
If you place a convex lens at the eye peice of microscope you will be able to obtain a image on the screen.

Answer 5

They can't.

The cornea and lens of the eye focus them to a real image on the retina.