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Is the inverted image formed in optical bench experiment using two pins and convex lens real or virtual ? how am i able to see it without screen if it is real ? we clearly see an inverted image of needle, but it appears to come from behind the lens rather than from air where real image should form. so it must be virtual ?

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marked as duplicate by V.F., Community Nov 14 '18 at 14:08

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An image that can be seen in focus on a screen is a real image. Sometimes a fuzzy, out-of focus image can be seen on a screen even though the light forms a virtual image somewhere on the "upstream" side of the projection optics.

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