When you sketched ray diagrams to show the location and size of a real image, yo

Question

When you sketched ray diagrams to show the location and size of a real image, you most likely used the principal rays. Suppose half of the lens were covered by a piece of dark paper so that two of these rays (parallel to the optical axis and passing through the center of the lens) were blocked. Could an image form under these circumstances? Try it with your apparatus; record your findings, Re-visit the PhET simulation "Geometric Optics" and choose the Many Rays option to help you understand your results.

Explanation / Answer

In these circumstances also the image will formed but the intensity of the image will be low, as the intensity of the image is proportional to the square of the aperture of the lens.

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