Lab Report Convex Lens PDF

Preview

Summary

CENTER OF FOUNDATION STUDIESUiTM DENGKIL LABORATORY REPORT FOUNDATION PHYSICS II PHYEXPERIMENT CONVEX LENSLAB INSTRUCTOR’S NAME NOOR ARDA ADRINA BINTI DAUDDATE OF EXPERIMENT 3 MARCH 2OSTUDENTS NAME NUR HIDAYAH BINTI HUZAINIZAR (2020817984)CHRISTINE MICULYN THOMAS LOGIJIN (2020820772)NOR ALYA ASHIRA ...

Description

CENTER OF FOUNDATION STUDIES UiTM DENGKIL LABORATORY REPORT FOUNDATION PHYSICS II PHY098

EXPERIMENT LAB INSTRUCTOR’S NAME DATE OF EXPERIMENT STUDENTS NAME

CONVEX LENS NOOR ARDA ADRINA BINTI DAUD 3 MARCH 2O21 NUR HIDAYAH BINTI HUZAINIZAR (2020817984) CHRISTINE MICULYN THOMAS LOGIJIN (2020820772) NOR ALYA ASHIRA BINTI FAIZUL SUTIARA(2020868524) AINA AFIQAH BINTI MALEK (2020603432) FARIS IRFAN BIN HASMADI(2020893046) SITI SOFIA BINTI MOHD JUSYERI(2020481664)

MARKS COMMENT

ABSTRACT

The purposes of this experiment are to determine the focal length of a convex lens by plotting a graph of 1/q versus 1/p and to determine the magnification of a convex lens. For this experiment, we had to conduct every procedure virtually through an online simulation that has allowed us to use a virtual convex lens and a virtual object which we were able to move its position from one point to another. The images formed were then recorded and compared based on their characteristics, distance from the lens, height of the image appeared and the magnification of the lens. Based on the results of this experiment, we were able to obtain an approximate focal length and determine the magnification of the convex lens which can be proven through the sample calculations we had done. The results shown from the graph we plotted have also verified the thin lens equation. Overall, not only were we able to achieve the aims of this experiment, but we also had the chance to acquire a much clearer understanding of how the convex lens works by conducting this experiment.

INTRODUCTION

Lens is defined as a piece of transparent material that is usually circular in shape, either concave or convex and is used to form an image of an object by focusing rays of light from the object. It is an optical system that is formed by two or more refracting surfaces. Examples of simple lens systems are sunglasses and magnifying glass. These systems can either converge or diverge or combination of both. There are two main types of lenses which are convex lens (converging) and concave lens (diverging). Convex lens is thicker in the middle than the edges while a concave lens is opposite with a convex lens. It is thicker at edges but thinner in the middle. The shape of a convex lens is to allow all the light rays that enter parallel to its normal line (axis) at a single point across one another. The point at which the ray crosses is called a focal point. Meanwhile, the distance between focal point to the centre of lenses is called focal length. Focal lengths manipulate the image produced. Formula of focal length is as shown below;

By definition, magnification is a change in size of image that is produced by an optical system compared to the true size. The object does not physically become larger but it appears to be larger. For example, a microscope and telescope. Microscope is used to make small objects to appear larger while telescopes function in making a far object to appear closer and the image becomes clearer and defined. Some examples of objects that need help of magnification are microorganisms, cells, and much more. The formula for magnification represent as ratio of height of image to ratio of height of object;

Other than that, formula of magnification also can represent by object distance and image distance such;

There are two types of magnification lenses which are simple and compound lenses. Simple lenses are commonly used when we read a newspaper. It refers to lenses that we use to

magnify objects. It has the lowest power and it can range from 2x to 6x. Magnifying glasses are the most common simple lens. Other than that, compound lenses also can magnify objects but the capacity of the magnifying is different. Compared to a simple lens, a compound lens can magnify the objects and the image produced is clearer. Plus, compound lenses can magnify the object by 4x, 10x, 40x, 100x and even 400x. Moreover, compound lenses are most commonly used in telescopes. The objectives of this experiment are to determine the focal length of a convex lens by plotting a graph of versus and to determine the magnification of a convex lens.

PROCEDURE Due to the pandemic of Covid-19, this face-to-face lab session that was supposed to be a hands on experiment has been canceled. Unfortunately, we did not get the chance to use the apparatuses for this experiment which are optical bench, light source, convex lens, lens holder, illuminated object and screen. As a replacement, we did a virtual experiment regarding the convex lens experiment. Firstly, we browsed through the internet and searched for the website that was told to be used. We searched for o  physics.com and clicked on it. Next, we clicked on the ‘light’ option and then on the ‘Concave and Convex Lenses’ option. There, we found a convex lens, movable arrows that represent the object's height (ho), object’s distance (p) and focal length (f) and a blue dot that represents focal point (f). Consequently, we approximately set a focal length (f) at 4 cm away from the convex lens by dragging the blue dot labelled as ‘focus’’ 4 units to the left of the lens. Judging on the diagram, it didn’t show us the double of the focal length (2f). Due to that, we noted by ourselves that the double focal length is at 8 cm away from the lens, which means, 4 units to the left of the focal length (f). Other than that, we also set the height of the object (ho) as 2 cm high by dragging the ‘object’ arrow 2 units upwards. At first, we started the experiment by evaluating the image formed when the object is placed at a distance less than the focal point (p...