The real image of an object placed between \( f \) and \( 2f \) from a convex lens can be seen on a screen placed at the image location. If the screen is removed, is the image still there? Explain.
Plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.
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Key ideas:
Real image exists even without a screen.
Plane mirror → always virtual image.
Convex mirror → real image possible only for virtual objects.
(I) Image formation by convex lens:
When an object is placed between \( f \) and \( 2f \) of a convex lens:
A real, inverted image is formed beyond \( 2f \)
Real image is formed due to actual convergence of light rays
If the screen is removed:
The image still exists at that position in space.
A screen is only needed to make the image visible by scattering light to the eye.
Without a screen, the image can still be seen by placing the eye at the image location.
Conclusion:
Yes, the real image still exists even if the screen is removed, because it is formed by actual intersection of light rays.
(II) Real images by plane and convex mirrors:Plane mirror:
Always forms virtual images for real objects.
Cannot produce real images under normal circumstances.
Convex mirror:
Also produces virtual images for real objects.
However, if the object is virtual (i.e., converging rays fall on the mirror), it can produce a real image.
Example:
If a converging beam (from another optical system) falls on a convex mirror, reflected rays may converge to form a real image.
Conclusion:
Plane mirror cannot form real images.
Convex mirror can form real images only when the object is virtual (incident rays are converging).
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