# focal length of concave mirror experiment

Find the length of the knitting needle l. 2. This gives the approximate focal length, f1 of the mirror. As the distance between the pole 0 of the concave mirror and the focus F is the focal length of the concave mirror. Repeat the experiment two or three times and find the mean value of the focal length.​, Measure the distance between the concave mirror and the screen with given metre scale. 1/f = 1/v + 1/u. 15. Measure the distance between the concave mirror and the screen with a metre scale. We use mirror formula for the determination of focal length. Comparing above equation with standard equation of a straight line, y = mx + c, graph between 1/v and 1/u should be a straight line with a slope of (–1) and intercepts on y-axes equal to (1/f), From this you can find the focal length of the given mirror. Place the knitting needle along the metre scale. 4. Reciprocal of it gives the focal length. 2. Place the other two uprights holding pins on the optical bench at different positions. 1. Fix the object-pin A at a point between, f1 and 2f1 but so that looking into the mirror, you will see a clear real, inverted and highly enlarged image of A. മലയാളം Fix the mirror in mirror-holder and adjust the tips of the pins so that they are in the same horizontal line as the pole of the mirror. A concave mirror should be always placed near an open window. 4. 7. Lam Ka Yue Kenneth 6S (20) Date of experiment : 27/10/2005 Figure (5) 3. (b) Determination of approximate focal length of the mirror. Fix concave mirror to mirror holder and place it on table.Turn the face of mirror towards a distant object (a candle in this case). 14. The selected object should be visible with your naked eyes. Focal Length of Concave Mirror Formula. Experiment: To find the value of v for different values of u in case of a concave mirror and find its focal length (f) by plotting graph between 1/u and 1/v. By obtaining the Real image of a distant object at its focus, the focal length of the concave mirror can be estimated as shown in the diagram. In an experiment to determine the focal length (f) of a concave mirror by the u-v method, a student places the object pin A on the principal axis at a distance x from the pole p. The student looks at the pin and its inverted image from a distance keeping his/her eye in line with PA. Measure the distance between the concave mirror and the screen with given metre scale. A concave mirror is a mirror that has an inside curvature which may affect how someone would look at the mirror and how the object is reflected from that mirror. 13. हिंदी 9. 2 The place where the five refracted rays cross each other is the focal point of the lens. Position the image-pin B beyond 2f1, so that there is no parallax between the tip of B and the tip of image of A. Following are the materials required for this experiment: An optical bench with three uprights; A concave mirror; A mirror holder; Two optical needles; A knitting needle; A half-metre scale; Theory. $$\frac { 1 }{ f } =\frac … EXPERIMENT 111: SPHERICAL MIRRORS ANALYSIS The aim of this experiment is to compute for the focal length of a concave mirror using mirror equations. Repeat the same procedure for image pin B also. Record your observations in observation table. 8. Concave mirror, optical bench with three uprights, mirror holder, two pins, knitting needle, metre rod, spirit level. For a concave mirror, the reciprocal of its focal length (f) is equal to the sum of the reciprocals of image distance (v) and the object distance (u). Repeat the process two or three times. Record the result in Table 6.1. In an experiment to find the focal length of a concave mirror, a graph is drawn between the magnitudes of u and v. The graph looks like : ... At what distance from a concave mirror of focal length 10cm should an object be placed so that: (a) its real image is formed 20 cm from the mirror? Level the optical bench with the help of spirit level and leveling screws. Take out the mirror from mirror-holder and hold it in such a way so that a clear distinct image of a distant object is obtained on the wall. Measure the focal length from the center of the convex lens to the focal point. Record the observations in tabulated form. 4. Repeat the procedure for the concave lens. Plot a graph with 1/u on x-axis and 1/v on y-axis, taking scone scale on both axes and start from zero on either axes. 3. Mirror formula is given as: \(\frac{1}{f}=\frac{1}{v}+\frac{1}{u}$$ Repeat the measurement by adjusting the distance between lamp-housing and the screen (s) to roughly about 5.4F, 5.8F, 6.2F and 6.6F. Repeat the experiment for different values of u (up to 2.5f) and in each time, measure v and record it in the tabular column. Experiment: To find the value of v for different values of u in case of a concave mirror and find its focal length (f) by plotting graph between 1/u and 1/v. Adjust the position of the screen in such a way that it forms a clear image of the candle on the screen. screen fixed on a stand or a white wall, an object (candle) and a metre scale. Measure the distance between the mirror and the wall with the help of a metre scale. Focal Length of Concave Mirror Experiment. (b) its virtual image is formed 20cm from the mirror? Note that in Step 2, the rays leaving the … A concave mirror, a mirror holder, a white screen fixed on a stand or a white wall, an object (candle) and a metre scale. Precautions. Thus, the focal length of a concave mirror can be estimated by obtaining a real image of a distant object at its focus. Read the intercept on y-axis. Find the observed length of knitting needle as measured on the optical bench-scale, l1. Developed by Amrita University & CDAC Mumbai. This measured distance is focal length of concave mirror. मराठी. This measured distance is. A short linear object, of length I, lies along the axis of a concave mirror of focal length f, at a distance d from the pole of the mirror. Calculate the focal length (f) of the concave mirror each time. Find the values of 1/u and 1/v for each observation, by taking u and v in metres. asked Jan 22, 2019 in Physics by kajalk ( 77.6k points) ray optics 10 cm is the focal length of the concave mirror. To get a well illuminated and distinct image of the distinct object, the distant object should be well illuminated. 12. 3. Using knitting needle, adjust the object-pin, so that the distance between the pole of the mirror and the tip of the pin is l. Now read the position of the mirror arid the object-pin A, on the scale of the optical bench. 5. Materials Required A concave mirror, a mirror holder, a small … 1. Funded by MeitY (Ministry of Electronics & Information Technology), English 3. The polished surface of the concave mirror and the distinct object should be facing each other. Repeat the process two or three times. As performed in the simulator. (c) Determination of v for different values of u. For a concave mirror, the reciprocal of its focal length (f) is equal to the sum of the reciprocals of image distance (v) and the object distance (u). Repeat the procedure for different positions of pin A between f1 and 2f1 and seeing that it is enlarged. Fix the mirror again in the mirror-holder. CBSE Class 10 Science Lab Manual – Focal Length of Concave Mirror and Convex Lens EXPERIMENT 4(a) Aim To determine the focal length of concave mirror by obtaining the image of a distant object. Calculate the focal length of the convex lens by using the formula given. Drag the screen by clicking on point A of the screen till you get a sharp image of the object. 6. To obtain the position of image for a given object distance and focal length of a mirror, the following mirror formula can be used. 11. Fix an upright at zero cm mark on the optical bench and put mirror holder in it. Calculate the focal length of the given concave mirror by using the relation, f = uv/(u+v). Read the position of its two ends, avoiding error due to parallax. Lets see the above shown diagram, Focal Length – The space between the pole P of concave mirror and the focus F is the focal length of concave mirror.

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