AP Physics

Mr. Jean

February 24th, 2012

The plan:

• Optics & Theory

• AP Booklet

• Physics Competition– Sir Issac Newton – CAP High School Competition

• Optics & Calculations

• Quest – Quest Assignment #1

AP Booklet:

Physics Competitions:

Readings for today’s class

• Chapter 23– P.632 to 642

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.

Reflection in Curved Mirrors:

Focal Point:• The focal point is the point in space at

which the reflected light meets along the principal axis.

Option #1: Behind C.

Option #2: In front of C.

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.

In General:

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)

Mirror Equation:

• Chapter 23 – Page 639

Magnification of a curved mirror:

• Chapter 23 – Page 639

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?

Quest

• Course Name: AP_Phy

• Unique Name: AP_Phy_MHS_2012– Register for this course. – Assignment #1

• Optics• Due on March 9th, 2012