Download - Image formation in lens
Objectives:
Compare the object and image in terms of
a. size
b. location from the lens
c. orientation
d. type
Objectives:
1. Locate the image in a lens through ray diagram.2. Describe the image in terms of
a. size b. location from the lensc. orientation d. type
Rules1. Any incident ray traveling parallel to the principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens.
2. Any incident ray traveling through the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis.
2F F F’ 2F’
OBJECT OUTSIDE 2F
IMAGE: between F’ and 2F’, smaller, inverted, real
2F F F’ 2F’
OBJECT: BETWEEN 2F and F
IMAGE: OUTSIDE 2F’ and F’, bigger, inverted Real
2F F F’ 2F’
OBJECT AT 2F
IMAGE: AT 2F’, same size, inverted, real.
2F F F’ 2F’
OBJECT at F
IMAGE: No image
2F F F’ 2F’
OBJECT between F and lens
IMAGE: INFRONT of the lens, bigger, UPRIGHT, VIRTUAL
IMAGE: Just a point, Real and Inverted
OBJECT: at INFINITY
OBJECT: At any point.
IMAGE: smaller, upright, virtual.
OBJECT LOCATION IMAGE DESCRIPTION
CONVEX LENS
OUTSIDE 2F
AT 2F
BETWEEN F and 2F
AT F
BETWEEN F and LENS
AT INFINITY
CONCAVE LENS
At any distance from the lens
Between F’ and 2F’, smaller, inverted, real
At 2F’, same size, inverted, real
Outside 2F’, bigger, inverted, real
No image
In front of the lens, bigger, upright, virtual
In front of the lens, bigger, upright, virtual
In front of the lens, bigger, upright, virtual
Assignment:
1. What are the equations in solving problems about lens?
2. Bring scientific calculator