Question 15 Marks
Draw ray diagrams for the cases of images obtained in concave mirrors as described in the table on page 122.
| No. | Position of the object | Position of the image | Nature of image | Size of the image |
| 1. | Between pole and focus | Behind the mirror | Erect, virtual | Magnified |
| 2. | At the focus | At infinity | Inverted, real | Very large |
| 3. | Between focus and centre of curvature | Beyond the centre of curvature | Inverted, real | Magnified |
| 4. | At the centre of curvature | At the centre of curvature | Inverted, real | Same as the object |
| 5. | Beyond the centre of curvature | Between the centre of curvature and focus | Inverted, real | Diminished |
| 6. | At a very large (infinite) distance | At focus | Inverted, real | Point image |
Answer
(a) A ray diagram for object at infinity for a concave mirror.
Image positionNature of imageAt focusReal, inverted and point image
(b) A ray diagram for object beyond centre of curvature for a concave mirror.
Image positionNature of imageBetween the centre of curvature and focus.Real, inverted and diminished.
(c) A ray diagram for object at the centre of curvature for a concave mirror.
(d) A ray diagram for object between F and C for a concave mirror.
(e) A ray diagram for obj ect at focus for a concave mirror.
Image positionNature of imageAt infinity.Real, inverted and highly magnified.
(f) A ray diagram for object between pole and focus for a concave mirror.
Image positionNature of imageBehind the mirror. Virtual, erect and magnified.
View full question & answer→(a) A ray diagram for object at infinity for a concave mirror.
Image positionNature of imageAt focusReal, inverted and point image(b) A ray diagram for object beyond centre of curvature for a concave mirror.
Image positionNature of imageBetween the centre of curvature and focus.Real, inverted and diminished.(c) A ray diagram for object at the centre of curvature for a concave mirror.
| Image position | Nature of image |
| At the centre of curvature. | Real, inverted and same size |
| Image position | Nature of image |
| Beyond the centre of curvature. | Real, inverted and magnified. |
Image positionNature of imageAt infinity.Real, inverted and highly magnified.(f) A ray diagram for object between pole and focus for a concave mirror.
Image positionNature of imageBehind the mirror. Virtual, erect and magnified.