Laboratory Lab Report Physics
Physics Lab Report Physics Lab Report
Title : Geometrical Optic
Name : Muhammad Syakir Farhan b. Sebery
Group : A
Date : 20 June 2013
Matrix no : CPM 17/12C
Lecturer’s name : Mr. Zikri
Introduction
An optical lens is made of transparent material such as glass or clear plastic. One or both surface usually has a spherical curve. There are two types of lenses, converging and diverging lens. A converging lens is called a convex lens. It is thicker at the centre than at the edges. A diverging lens is called a concave lens. It is thinner at the centre than at the edges.
For a convex lens, light rays parallel and close to the principal axis are refracted inwards and converge to a focal point, F after passing through the lens. For a concave lens, light rays parallel and close to the principal axis are refracted outwards and appear to diverge from the focal point, F after passing through the lens.
The focal point, F is a common point on the principal axis where all rays close and parallel to the axis converge to it after passing through a convex lens, or appear to diverge from it after passing through a concave lens.
The focal length, f of a lens is the distance between the focal point and the optical centre of the lens.
For a convex lens, the ticker the lens is at the centre, the shorter is the focal length of the lens. For a concave lens, the thinner the lens is at the centre, the shorter is the focal length of the lens.
Objective: To determine the focal length of a convex lens.
Theory
From the lens formula,
1 = 1 + 1 f u v v = v + 1 f u m = v - 1 f
where m = | v | is the linear magnification. | u |
Hence the graph m versus v is a straight line graph.
The equation also shows that m is directly proportional to v.
m = 1 when v = 2 f
Title : Geometrical Optic
Name : Muhammad Syakir Farhan b. Sebery
Group : A
Date : 20 June 2013
Matrix no : CPM 17/12C
Lecturer’s name : Mr. Zikri
Introduction
An optical lens is made of transparent material such as glass or clear plastic. One or both surface usually has a spherical curve. There are two types of lenses, converging and diverging lens. A converging lens is called a convex lens. It is thicker at the centre than at the edges. A diverging lens is called a concave lens. It is thinner at the centre than at the edges.
For a convex lens, light rays parallel and close to the principal axis are refracted inwards and converge to a focal point, F after passing through the lens. For a concave lens, light rays parallel and close to the principal axis are refracted outwards and appear to diverge from the focal point, F after passing through the lens.
The focal point, F is a common point on the principal axis where all rays close and parallel to the axis converge to it after passing through a convex lens, or appear to diverge from it after passing through a concave lens.
The focal length, f of a lens is the distance between the focal point and the optical centre of the lens.
For a convex lens, the ticker the lens is at the centre, the shorter is the focal length of the lens. For a concave lens, the thinner the lens is at the centre, the shorter is the focal length of the lens.
Objective: To determine the focal length of a convex lens.
Theory
From the lens formula,
1 = 1 + 1 f u v v = v + 1 f u m = v - 1 f
where m = | v | is the linear magnification. | u |
Hence the graph m versus v is a straight line graph.
The equation also shows that m is directly proportional to v.
m = 1 when v = 2 f