Determining the Focal Length of a Convex Lens Experiment

In this experiment we have chosen two methods to find out the focal length of a spherical lens. Following graphic illustrates a simple lens model.

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In the situation where the image moves opposite to the direction that I move my eyedo I have to move the observation pin towards my eye or away from my eye.

. 3 where h height of the. OUTCOMES You should be able to 1. If two lenses of fecal lengths f 1 and f 2 are kept in contact the focal length F of the combination is given by.

2 The place where the five refracted rays cross each other is the focal point of the lens. Repeat the procedure for the concave lens. So the power of a lens is defined as the reciprocal of its focal length.

Measure the focal length from the center of the convex lens to the focal point. 1F 1f 1 1f 2. Based on this experiment after the data was calculated the focal length of a convex lens was 14 0 cm where the value of the 0 was determined from the sum of f-x 2.

To determine the focal length and power of a convex lens by plotting 1u and 1v graph. Note that in Step 2 the rays leaving the lens are diverging and they will not cross. Where u object distance v image distance.

This is about the experiment where we determine the focal length of a convex lens using the graphical method the no parallax method. The experiment is repeated by increasing the values ofu in steps of 5 cm starting from a convenient value less than 2f so that at least two readings are obtained with valuesof u less than 2fThe mean focal length f of the lens calculated from those obtained from the obsrvation the radings are tablated. A convex lens stand wire gauze object screen and measuring scale.

The graph between frac 1u and frac 1v for a thin convex lens in order to determine its focal length is plotted as shown in the figure. A lens of short focal length produces more deviation of light than that of a lens of larger focal length. V is the distance of the image screen from the convex lens.

To determine the focal length of a spherical convex lens by Lens formula method by Lens replacement method. To determine the focal length of a convex lens by using. The aim of this.

For a thin double convex lensrefractionacts to focus all parallel rays to a point referred to as the principal focal point. The distance from the lens to that point is the principal focal length f of the lens. The distance between the optical centers to the.

To compare both methods. It can be seen that it has two. As per new cartesian sign convention focal length of a concave lens is negative and the focal length of a.

Below is the derivation of the lens formula. Focal Length of Convex LensB11 Lab Report Objectives of the experiment. According to the theory of convex lens the focal length of a lens f is related to the object distance p and image distance q by lens equation which is 1 f 1.

How To Perform Experiment 1. Also the sum of object and image distance is greater than or equal to 4 times the focal length of the lens when real images are formed on a screen. Viewed 4k times.

Anthony GLeigh 2011 Modified by Enas Ismail and Nazaire Nsanzimana May 2020 EXPERIMENT 3 FOCAL LENGTH OF A CONVEX LENS Aim. The refractive index of length is 15 and its both the surfaces have same radius of curvatures R. Therefore there are two positions of a lens that will give rise to a focused image on a screen if the screen and object are separated by a distance greater than 4 x focal length of the lens.

Determine the rough focal length of the convex lens with the help of metre scale by. In this experiment we have chosen two methods to find out the focal length of a spherical lens. The aim of this experiment is to determine the focal length of a convex lens.

Record the result in Table 61. To determine the focal length of a spherical convex lens by Lens formula method by Lens replacement method. Here u is the distance between the object light source and the convex lens.

Effectively follow procedure for. The value of R will be ____cm. 16 Physics Practical Compiled by Ignatius John Martin Kudinha L.

Determine the focal length of a concave lens by combining it with a suitable convex lens.

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