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4. Image formation by mirror

Concave Mirror Ray Diagram

  • Concave Mirror Ray Diagram lets us understand that, when an object is placed at infinity, a real image is formed at the focus. The size of the image is much smaller compared to that of the object.

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

When an object is placed at the center of curvature and focus, the real image is formed at the 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 larger than compared to that of the object.

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

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

Summary

S. NoPosition of ObjectPosition of ImageSize of ImageNature of Image
1At infinityAt the focus FHighly DiminishedReal and Inverted
2Beyond the center of curvature CBetween F and CDiminishedReal and Inverted
3At the center of curvature CAt CSame SizeReal and Inverted
4Between C and FBeyond CEnlargedReal and Inverted
5At focus FAt InfinityHighly EnlargedReal and Inverted

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