Question

19. Write the rule for tracing curve in concave mirror with example,
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Answer 1

Answer:

Any incident ray traveling parallel to the principal axis on the way to the mirror will pass through the focal point upon reflection. Any incident ray passing through the focal point on the way to the mirror will travel parallel to the principal axis upon reflection.

Explanation:

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Answer 2

Answer:

Two convenient and commonly used rules of reflection for concave mirrors are: image of an object for a concave mirror was determined by tracing the path of the location, orientation, size and type of image produced by a concave mirror

Explanation:

Rules for Obtaining Images Formed by a Concave Mirror

1. A ray coming parallel to the principal axis is reflected through the principal focus of the concave mirror.
2. The ray of light passing the principal focus becomes parallel to the principal axis after being reflected from the mirror.
3. A ray of light which is coming through the center of curvature is reflected back along the same path.
4. A ray of light incident on the pole, at an angle "O" with the principal axis, is reflected by the same angle "O".

IMAGE FORMATION BY CONCAVE MIRROR

1. First Position:  (Beyond 'C'). When the object is placed beyond the center of curvature C, then the image will be formed between the focus and the center of curvature; between 'F' and 'C'. This image will be real, inverted and smaller in size.
2. Second Position: (at 'C'). When the object is placed at the center of curvature. The image is formed at the center of curvature C and is real, inverted and equal in size.
3. Third Position: (Between 'C' and 'F'). When the object is placed between the center of curvature C and focus F, then the image formed will be beyond C. This image will be real, inverted and larger than the object.
4. Fourth Position: (at 'F'). When the object is placed at the principal focus, then the image will be real, inverted, larger and at infinity.
5. Fifth Position: (between 'F' and 'P'). When the object is placed between the pole and principal focus, then virtual, erect and larger image will be formed