formation of images by ? concave convex me ryor and lens convex, concave lens only. diagrams on yay
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Convex Lenses
When an object is placed at infinity, the real image is formed at the focus. The size of the image is much smaller than that of the object.

When an object is placed behind the center of curvature, the real image is formed between the center of curvature and focus. The size of the image is the same as compared to that of the object.

When an object is at the center of curvature, the real image is formed at the other center of curvature. The size of the image is the same as compared to that of the object.

When an object is placed in between the center of curvature and focus, the real image is formed behind the center of curvature. The size of the image is smaller than that of the object.

When an object is placed at the focus, a real image is formed at infinity. The size of the image is much larger than that of the object.

When an object is placed in between focus and pole, a virtual image is formed. The size of the image is larger than that of the object.

Concave Lenses
When an object is placed at infinity, a virtual image is formed at the focus. The size of the image is much smaller than that of the object.

When an object is placed at a finite distance from the lens, a virtual image is formed between the pole and the focus of the convex lens. The size of the image is smaller than that of the object.

Summary of Image Formation by Concave and Convex Lens
Image formation by Concave LensObject LocationImage LocationImage NatureImage SizeInfinityAt F2Virtual and ErectHighly DiminishedBeyond Infinity and ZeroBetween F1 and Optical centerVirtual and ErectDiminished
Image formation by Convex LensObject locationImage locationImage natureImage sizeInfinityAt F2Real and InvertedDiminishedBeyond 2 F1Between 2F2 and F2Real and InvertedDiminishedBetween 2F1 and F1Beyond 2F2Real and InvertedEnlargedAt F1At infinityReal and InvertedEnlargedAt 2 F1At 2F2Real and InvertedSame sizeBetween F1 and 0On the same side as the objectVirtual and ErectEnlarged
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