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Recap
Recap
Light travels in straight path
Ray that striking surface = incident ray
Color of visible light with shortest wave length and highest frequency is violet with around 380 nanometers.
Whereas red has longest wavelength, at around 700 nanometers.
If you can't see your shoes in a mirror, stepping closer won't help
Plane mirrors create false images
Light rays intersect at eyes to form image of your reflection
To create virtual image using concave mirror, you would have to be between focus and mirror.
Virtual image is copy of object formed at location from which light ray appears too come.
Question:
Question:
You walk into a dark room and turn on a flashlight.
You see an image of the flashlight reflecting off a plane mirror in front of you.
The image is 6.2 m away from you. How far away is the plane mirror from you?
Answer: The image formed in a plane mirror is an equal distance behind the mirror as the object in front of it. This mean that the plane mirror is 8.4/2 = 4.2 meters away from the flashlight.
Terms in Equations
Terms in Equations
di = distance of image from optical centre
do = distance of object from optical centre
hi = height of image
ho = height of object
f = focal length
M = Magnification, image's ratio height (hi) to object height (ho )
Vocabularies
Vocabularies
Convex: having outline or surface curved like the exterior of a circle or sphere.
Concave: having outline or surface that curves inward like the interior of a circle or sphere.
Converge: lines meeting at one point
Inverted: Placed upside down
Upright: Placed/standing straight
Centre of Curvature (C): The centre of the sphere whose surface has been used to make the mirror.
Principal Axis: the line through the centre of curvature to the midpoint of the mirror.
Vertex (V): The point where the principal axis meets the mirror.
Focus (F): the point where reflected rays from parallel incident rays pass through, or converge.
Reflect: to bounce off
This is why concave mirrors are sometimes called converging mirrors
Normal line: a line can be drawn perpendicular to the surface of the mirror.
Virtual image: a copy of an object created from diverging light rats that eyes follow behind the mirror at the location from which the light rays appear to come.
Real image: occurs where
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