Determining the Focal Length of a Convex Lens Experiment

Record the result in Table 61. Effectively follow procedure for determining.

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. Since the lens is a convex lens so its power will be positive. Note that in Step 2 the rays leaving the lens are diverging and they will not cross. Focal Length of a Convex Lens A convex lens is shown above.

Focal Length of Convex LensB11 Lab Report Objectives of the experiment. 3 where h height of the. Measure the distance between the screen and the convex lens with the help of the measuring scale.

Following graphic illustrates a simple lens model. To compare both methods. 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.

The convex lens is mounted in thev groove of the lens stand with its principal axis horizontallythe lens is focussed towards a distant object like a tall tree palm tree or electrical pole through the window of the laboratorythe position of the screen is adjusted on the other side of the lens until a clear. Fix the lens in the lens holder in the middle upright and place the object-pin AB at a distance greater than rough focal length on one side of the lens. A distant object method.

OUTCOMES You should be able to 1. Adjust the position of the convex lens and the screen so as to get a sharp inverted and diminished image. Forming the image of a distant object on the wall.

Below is the derivation of the lens formula. Place the screen behind the convex lens. Measure the focal length from the center of the convex lens to the focal point.

Power of a lens P 100ƒ cm Diopter D or 1ƒ or P 1ƒ cm Diopter D. 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.

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. For a thin double convex lensrefractionacts to focus all parallel rays to a point referred to as the principal focal point. Anthony GLeigh 2011 Modified by Enas Ismail and Nazaire Nsanzimana May 2020 EXPERIMENT 3 FOCAL LENGTH OF A CONVEX LENS Aim.

It can be seen that it has two curved surface concaving towards the axis of the lens. This distance is equal to the approximate focal length of the convex lens f 2. So if the focal length of a lens is known the power of that lens can be determined by the following equation.

To determine the focal length of a spherical convex lens by Lens formula method by Lens replacement method. How To Perform Experiment 1. 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. The distance from the lens to that point is the principal focal length f of the lens.

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