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Concave (converging) Mirrors

Curved Mirrors Part 1 SNC2D1. Concave (converging) Mirrors. South Down, England. V: Vertex The point where the principal axis intersects the mirror at a 90 o angle. C: Center of curvature (center of the sphere). F. F: Focus Midpoint between C and V.

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Concave (converging) Mirrors

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  1. Curved Mirrors Part 1 SNC2D1 Concave (converging) Mirrors South Down, England

  2. V: Vertex The point where the principal axis intersects the mirror at a 90o angle C: Center of curvature (center of the sphere) F F: Focus Midpoint between C and V Principal axis: the line through the center to the midpoint of the mirror

  3. The point where the lines converge is the focus

  4. principal axis Concave Mirrors(caved in) • C • F • V Light rays that come in parallel to the principal axis reflect through, or converge, at the focal point

  5. principal axis Concave Mirrors(caved in) • C • F • V Light rays that go through the focal point reflect parallel to the principal axis

  6. principal axis Concave Mirrors(caved in) • C • F • V Light rays that go through the centre reflect back along the same path.

  7. principal axis Concave Mirrors(caved in) • C • F • V Light rays that go through the vertexproduce an angle of reflection like in plane mirrors.

  8. Locating the image using ray diagrams 4 steps to follow: • Draw light ray parallel to principal axis, it will reflect through the focal point • Draw light ray through focal point, it will reflect parallel to the principal axis • Draw light ray through center of curvature, and it will reflect back the same direction (‘normal’ line) • A ray going through V, will produce θi, find θr to determine reflected ray

  9. principal axis Concave Mirror(Example 1: Object placed outside the center) • C • F S – the image is smaller A – the image is inverted L – the image is in front of the mirror T – the image is real • You can use the two lines produced by 1 and 2 • on the rules slide to find the image

  10. principal axis Concave Mirror(Example 2: Object placed in front of the focus) • C • F S – the image is larger A – the image is upright L – the image is behind the mirror T – the image is virtual • You can use the two lines produced by 1 and 2 • on the rules slide to find the image

  11. principal axis Concave Mirror(Example 3: Object placed at the focus) • C • F • There is no image produced because • the extension of the reflected rays • never converge • You can use the two lines produced by 1 and 2 • on the rules slide to find the image

  12. principal axis Concave Mirror(Example 4: Object placed at the center) • C • F S – the image is same size A – the image is inverted L – the image is in front of the mirror T – the image is virtual • You can use the two lines produced by 1 and 2 • on the rules slide to find the image

  13. principal axis Concave Mirror(Example 5: Object placed in between the C and F) • C • F S – the image is same larger A – the image is inverted L – the image is in front of the mirror T – the image is virtual • You can use the two lines produced by 1 and 2 • on the rules slide to find the image

  14. principal axis Concave MirrorNow you try one…Draw the two rays and see what happens – Hint look at example 1 • C • F S – the image is same __________ A – the image is _______________ L – the image is _______________ T – the image is _______________ • You can use the two lines produced by 1 and 2 • on the rules slide to find the image

  15. Images in a converging mirror - summary • When an object is beyond C, at C, or between C and F, the reflected rays actually meet in front of the mirror, forming an inverted, real image each time REAL IMAGE: can be formed on a screen because light rays are actually arriving at the image location • When the object is between F and V, the image is larger than the object, • virtual and upright. VIRTUAL IMAGE: can be formed on a screen because light rays are not arriving at the image location • When the object is at F no clear image is seen.

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