What is the position of the image when an object is placed at different distances?

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Detailed Solution

Image position depends on object distance relative to focal length; use the standard lens/mirror rules below.

Device	Object position	Image position	Nature
Concave mirror	At ∞	At focus F	Real, inverted, highly diminished
Concave mirror	At C (2F)	At C	Real, inverted, same size
Concave mirror	Between F and C	Beyond C	Real, inverted, magnified
Concave mirror	Between pole and F	Behind mirror	Virtual, upright, magnified
Convex mirror	Anywhere	Behind mirror between F and pole	Virtual, upright, diminished
Convex lens	At ∞	At focus F	Real, inverted
Convex lens	At 2F	At 2F other side	Real, same size
Convex lens	Between F and 2F	Beyond 2F	Real, magnified
Convex lens	Within F	Same side	Virtual, magnified
Concave lens	Anywhere	Between lens and F	Virtual, upright, diminished