Post on 31-Dec-2015
transcript
The plan:
• Optics & Theory
• AP Booklet
• Physics Competition– Sir Issac Newton – CAP High School Competition
• Optics & Calculations
• Quest – Quest Assignment #1
Diverging Mirrors:
• A diverging lens will cause rays parallel to the principal axis to radiate from a virtual focus. Rays passing through the center are not deflected.
Focal Point:• The focal point is the point in space at
which the reflected light meets along the principal axis.
Concave Mirrors: Two Rules• 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.
Mirror Equation Terms:
• f = focal length (m)• r = radius of curvature (m)• d0 = objective distance (m)• di = image distance (m)• m = magnification of a mirror, which is
defined as the height of the image. • hi =image height (m)• ho = object height (m)
More common notation:
• p = object location (m)
• q = image location (m)
• h’ = image height (m)
• h = object height (m)
Concave Mirrors:
• When light enters from a very far distance object we can use a very nice approximation.
• f = r / 2
Flat Mirror Example:
• A person wishes to take a picture of themselves through a mirror. If the camera is 1.7m in front of the mirror, at what distance should the camera lens be focused to?
Concave Mirror:
• A concave mirror with a radius of curvature of 0.75m is illuminated by a candle located on the symmetry of axis 2.75m from the mirror.
• Where is the image of the candle?
Convex Mirror:
• An object is 15 cm from the surface of a reflective spherical Christmas-tree ornament 6cm in diameter.
• What is the position of the image?