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Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.

Reflection of Light

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Answer

The image formed moves away from the concave mirror when an object is moved from infinity towards the pole of mirror.

The image is diminished when the object is beyond centre of curvature, but it becomes magnified as the object comes within the centre of curvature. The image is of the same size of the object when the object is at the centre of curvature.

For the object situated beyond focus, the image is always real and inverted, whereas for the object situated between the focus and pole the image is upright and virtual.

The table below shows the position, size and nature of the image formed by a concave mirror for different positions of the object.

No.Position of the objectPosition of the imageSize of the imageNature of the image
1At infinityAt the focusDiminished to a pointReal and inverted
2At very far distanceIn focal planeHighly diminishedReal and inverted
3Beyond the centre of curvatureBetween the centre of curvature and focusDiminishedReal and inverted
4At the centre of curvatureAt the centre of curvatureSame sizeReal and inverted
5Between the centre of curvature and focusBeyond the centre of curvatureMagnifiedReal and inverted
6At focusAt infinityHighly magnifiedReal and inverted
7Between the focus and the poleBehind the mirrorMagnifiedVirtual and upright

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