Curved Mirrors & Lenses

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Real or Virtual?:

Real or Virtual? Real images A real image is one which can be produced on a screen and is formed by rays that converge. Imaginary images A virtual image cannot be formed on a screen and is produced by rays which only seem to come from the image.

Lateral Inversion:

Lateral Inversion Image where left and right are swapped.

Slide 3:

Upright Inverted

Reflection off a plain mirror:

Reflection off a plain mirror

Reflection off a plain mirror:

Reflection off a plain mirror Image is: Virtual. Upright. The same size as object. Laterally inverted. Apparent distance from mirror to image is the same as the distance from the object to the mirror.

Reflection off a convex mirror:

Reflection off a convex mirror F = virtual focal point

Reflection off a convex mirror:

Reflection off a convex mirror Image is: Virtual Smaller than object Upright

Reflection off a concave mirror:

Reflection off a concave mirror F = real focal point

Reflection off a concave mirror:

Reflection off a concave mirror Type of image formed depends on the distance of the object from the mirror.

Reflection off a concave mirror:

Reflection off a concave mirror If object is between mirror and F image is: Virtual Upright Larger

Reflection off a concave mirror:

Reflection off a concave mirror If object is further than F from the mirror image is: Real Inverted Laterally inverted As the distance is increased the image size decreases. http://www.phys.ufl.edu/~phy3054/light/mirror/applets/cavemir/Welcome.html

Drawing a ray diagram for a concave mirror:

Drawing a ray diagram for a concave mirror F F 1 2 Draw a ray that travels parallel to the axis towards the mirror and reflects through the focal point in front of the mirror. Draw a ray that travels through the focal point in front of the mirror and reflects parallel to the axis. Example 1

Drawing a ray diagram for a concave mirror:

Drawing a ray diagram for a concave mirror F F 1 2 Draw a ray that travels parallel to the axis towards the mirror and reflects through the focal point in front of the mirror. Draw a ray that reflects off the centre of the mirror at the same angle it was incident. Example 2

Drawing a ray diagram for a convex mirror:

Drawing a ray diagram for a convex mirror F F 1 2 Example 1 Draw a ray that travels parallel to the axis towards the mirror and reflects in a direction that makes it look like it originated at the focal point behind the mirror. Draw a ray that travels towards the focal point behind the mirror and reflects parallel to the axis.

Drawing a ray diagram for a convex mirror:

Drawing a ray diagram for a convex mirror F F 1 2 Example 2 Draw a ray that travels parallel to the axis towards the mirror and reflects in a direction that makes it look like it originated at the focal point behind the mirror. Draw a ray that travels towards the focal point behind the mirror and reflects parallel to the axis.

Light through a concave lens:

Light through a concave lens

Light through a concave lens:

Light through a concave lens Light rays diverge. They appear to originate from a focal point in front of the lens. The image is: Virtual Upright

Light through a convex lens:

Light through a convex lens f = focal length F = focal point C = optical centre

Light through a convex lens:

Light through a convex lens Light rays converge to focal point behind lens. Type of image formed depends on the distance of the object from the lens. http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=48

Light through a convex lens:

Light through a convex lens If an object is further than 2F image is: Real Inverted Smaller

Light through a convex lens:

Light through a convex lens If an object is at 2F image is: Real Inverted Same size

Light through a convex lens:

Light through a convex lens If an object is between 2F and F image is: Real Inverted Larger

Light through a convex lens:

Light through a convex lens If an object is between F and C image is: Virtual Erect Larger

Drawing a ray diagram for a convex lens:

Drawing a ray diagram for a convex lens Draw: A ray straight through the centre of the lens. A ray that travels parallel to the axis towards the lens and refracts through the focal point behind the lens. A ray through the focal point in front of the lens that refracts parallel to the axis.

Drawing a ray diagram for a convex lens:

Drawing a ray diagram for a convex lens F F 1 2 3 Example 1

Drawing a ray diagram for a convex lens:

Drawing a ray diagram for a convex lens F F 1 2 Example 2

Drawing a ray diagram for a concave lens:

Drawing a ray diagram for a concave lens Draw: A ray straight through the centre of the lens. A ray that travels parallel to the axis which refracts as if it came from the focal point in front of the lens. A ray that travels towards the focal point behind the lens which refracts parallel to the axis.

Drawing a ray diagram for a concave lens :

Drawing a ray diagram for a concave lens F F 1 2 3 Example 1

Drawing a ray diagram for a concave lens :

Drawing a ray diagram for a concave lens F F 1 2 3 Example 2

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