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CURVED MIRRORS

CURVED MIRRORS. Formation. A curved is formed by cutting out a circular piece of glass from a hollow glass sphere and silvering the outside or inside. C is called the centre of sphere is called the centre of curvature of the mirror. Mirror Terms.

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CURVED MIRRORS

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  1. CURVED MIRRORS

  2. Formation • A curved is formed by cutting out a circular piece of glass from a hollow glass sphere and silvering the outside or inside. C is called the centre of sphere is called the centre of curvature of the mirror

  3. Mirror Terms • C the centre of the sphere is called the centre of curvature of the mirror • P is the centre of the mirror • An imaginary line drawn passing through C and P is called the principal axis of the mirror.

  4. Concave Mirror • A beam of light parallel to the principal axis is brought to a focus after reflection from a concave mirror. • The focal point is called the principal focus F.

  5. Concave Mirror The focal length is the distance between the centre of the mirror and the principal focus

  6. Concave Mirror

  7. Convex Mirror

  8. Convex Mirror • Light rays parallel to the principal axis reflects from the mirror so that they appear to be coming from a point behind the mirror • The apparent focal point is called the principal focus F

  9. Convex Mirror • The focal length is the distance between the centre of the mirror and the apparent focal point • Called a virtual focus

  10. Concave Mirrors • How can we predict the nature and position of the image formed by a concave mirror?

  11. Ray Tracing-Image formation • 3 rays are used to find the position and nature of the image formed by a mirror.

  12. Ray Tracing-Image formation • A ray parallel to the principal axis will pass through the principal focus • A ray passing through the focus will travel parallel to the principal focus • A ray through C will reflect back through C

  13. Image formation by Concave Mirror • Draw vertical line representing the mirror. • Draw a horizontal line through the centre of the mirror representing the principal axis. • Place a dot on the horizontal line to represent F, the principal focus a distance f from mirror centre P.

  14. Image formation by Concave Mirror • Place a second dot at a point on the horizontal line representing C the centre of curvature, 2f from P. • Place the object at C • From the head of the object draw a ray parallel to the principal axis • From the head of the object draw a ray passing through F that will travel parallel to the principal axis after reflection

  15. Extend the reflected rays until they intersect • Where these rays intersect the head of the image will be formed • If a screen is placed at this point the image will form on it. • The image will be real, same size as the object, inverted and at C.

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