Question

The image of an object formed by a convex is obtained on a screen. Will the full size of image be obtained if the lower half of the is made completely opaque?

Solution

Yes, the full size of the image will be obtained but the illumination of the image will be less. Rays of light from all points of the object will be incident on both half of the lens. But the ray’s incident on the opaque half will not take part in the formation of the image. Only rays falling onthe other half, will form the image.

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