Class Notes (807,456)
Canada (492,742)
Physics (299)
PHYS 101 (41)

November 20.doc

2 Pages
Unlock Document

McGill University
PHYS 101
Kenneth Ragan

Phys 101 Alanna Houston November 20, 2007 - Primarily see virtual image - In the example of a real image, you would only see the image clearly if you were further from the mirror than the image (so your eye received diverging rays) - Concave shapes can also be used for other waves (sound mirror) - Convex mirrors can also use the mirror equation. Focal length is: f = r/2 - Careful with the sings of distances: f is negative in this case (but the rest of our sign convention is unchanged) - A convex right-hand rear view mirror on a car. Radius of curvature is 16.0 m. What is the image location and magnification for an object 10.0 m away? Most mirrors like this carry a warning: “objects in this mirror may be closer than they appear!” Why? o r = 16.0 m o f = -8.0 m o 1/do + 1/di = 1/f o 1/di = -1/8 – 1/10 o -4.44 m = di o m = -4.4 / 10 = +0.44 - You look into a shiny Christmas tree ball (diameter 9.0 cm) from 30.0 cm away. Where is your image? Is it real or virtual? Upright of inverted? o 1/do + 1/di = 1/f o r = 4.5 cm o f = -2.25 cm o –1/2.25 = 1/30 + 1/di o di = -2.09 cm = 2.1 cm o m = -di / do = - -2.1/3.0 = 1/15 = upright o therefore, virtual and upright THIN LENSES - made up of spherical surfaces where the radius of curvature is large compared to the lens size so we ignore spherical aberration: that is, we assume that parallel rays are focussed at the focal point at the focal length f from the lens: look at picture - look at pictures of converging and diverging lenses. - With ray tracing, we can draw the position of the image
More Less

Related notes for PHYS 101

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.