Object to determine the wavelength of sodium light by newtons ring. Experiment 4 determine radius of curvature of spherical surface by. To determine radius of curvature of a given spherical surface by a spherometer. Diagram formula the mean wavelength of d1 and d2 lines of sodium light is given by the formula. Practical report structure practical reports have a clear, linear structure. Basically it is a screw with an accurately constant pitch the amount by which the thimble moves forward or backward. A spherometer, a plane glass plate and a spherical surface. Spherometer, convex surface it may be unpolished convex mirror, a big size plane glass slab or plane mirror. The most common application of a spherometer is the measurement of an unknown lens shape, in order to study its optical characteristics. To determine radius of curvature of a given spherical surface. To measure the dimensions of a given regular body of known mass using a vernier callipers and hence find its density. Note, h measures the difference in the lengths of the.
For the love of physics walter lewin may 16, 2011 duration. A spherometer is an instrument for the precise measurement of the radius of curvature of a sphere or a curved surface. Place the spherometer on the surface of the mirror. With the aid of a stopwatch, observe the time of 50 full vibrations and determine the period. The physics practical class 11 is given here to help students prepare for their exam. Find the pitch of the screw by determining the vertical distance covered in 4 or 5 rotations.
There are 30 experiments in three groups a, b and c. Class xi radius of curvature by spherometer physics practical. This is the reference zero position for the subsequent sample measure ment. Support the pendulum on the knifeedge at the hole nearest to one end of the bar, making sure that it swings freely in a vertical plane. Ue1010100 spherometer objective summary experiment. To determine the thickness of a glass plate using spherometer. Jul 19, 2019 to write a physics lab report, start by putting together a cover sheet with your name, and the title and date of the experiment. This may include how you measured the data or any other idea that you feel is appropriate. But an essential part of the cbse exam is the practical exams which consist of 30 marks. The circuit diagram usually for experiments on electricity 5. To find the weight of a given body using parallelogram law of vectors. Because the ball is not accelerating vertically, the vertical component of the tension cancels the weight t cos. Spherometer experiment pdf to determine radius of curvature of a given spherical convex surface by a spherometer. To determine the wavelength of sodium light using newtons.
How to write a physics lab report with pictures wikihow. So, students must perform their physics practical exams diligently to perform better in the final exam. The three legs of the spherometer form a equilateral triangle of. How to use spherometer to measure the thickness of an object. The micrometer screw gauge also uses an auxiliary scale measuring hundredths of a millimetre which is marked on a rotary thimble. Physics lab manualncert solutions class 11 physics. Report of experiment the report of each experiment should start from a fresh page in your notebook. The least count for a spherometer of 100 equal divisions and of pitch 0. When a spherometer is placed on a curved surface such that all its legs are touching it, the middle leg will be a little higher or lower than the plane of the outer legs by a small amount h which is related to r, the radius. The ultraspherotronic, the latest addition to our line of automatic spherometers, is the response to increased accuracy requirements in. There will be a practical examination of 20 marks apart from the theory examination.
To measure the dimensions of a given regular body of known mass using a. Start looking for exact coincidence of a vernier scale division with. With the digital indicator, turn it on if needed, then press the zero button. Notes your conclusion should be a maximum length of one page. Repeat steps 4 to 6 of part a of the experiment to obtain depth of the given beaker. Note, h measures the difference in the lengths of the center screw and the three feet and b is the length of the side of the triangle formed by the feet. A small vertical scale known as the pitch scale p with the scale. To determine radius of curvature of a given spherical surface by a. To determine the wavelength of sodium light using newtons rings table 8. Cbse practicals for class 11 physics lab manual work list of experiments to be performed for class 11 physics during practical exams in science subject. This tool will measure the curvature of nearly any surface that fits between the 3 points 40mm apart.
For a more detailed explanation see the spherometer section on atrotel. The spherometer constant r is determined by taking the average distance between the central contact point and the three outer contact points with the spherometer zeroed. Record the main scale division just to the left of the zero mark of the vernier scale. Example conclusion physics 1cl fall 2010 example conclusion in this lab, we studied the motion of a tennis ball on a string moving in horizontal circles. I nearly leapt out of my chair in the realisation that here was undoubtedly the seed of a practical solution to a practical problem, and one which the author one professor seto had never even considered the possibility of.
A spherometer works on the principle of the micrometer screw. In making this determination, begin with the count of zero as the pendulum passes through its. A spherometer for determining the radius of a basically circular cylindrical object such as a tube comprises first means defining a chord between two points of the circumference of a circle belonging to the crosssection of the object in the plane perpendicular to the axis of the part of the object whose basic geometrical form is a circular cylinder, second means for measuring the sagitta of. Apparatus spherometer, convex surface it may be unpolished conv. Ultra spherotronic unsurpassed accuracy for test plates calibration. It is used to measure either very small thickness of flat materials like glass or the radius of curvature of a spherical surface thus getting its name. It is a precise apparatus with a vertical measuring. The physics practical consists of various interesting experiments, which are also essential for their 12th standard practical exam. Spherometer definition is an instrument for measuring the curvature of a surface. A precision flat is put on the selected spherometer ring. To determine radius of curvature of a given spherical convex surface by a spherometer. Spherometer travelling microscope triple beam balancefour beam balance scientific electronic balance stop clockstopwatch digital stopwatch digital multimeter laboratory practical s using measuring instruments vernier calipers micrometer screw gauge spherometer. Physics syllabus implemented from 2017 department of science national institute of education maharagama sri lanka. Spherometers are small precision instruments for measuring the radius of curvature of spherical surfaces.
The micrometer screw gauge is used to measure even smaller dimensions than the vernier callipers. Spherometer definition of spherometer by merriamwebster. Spherometer is for measuring the curvature of a round surface. To plot a graph between the distance of the knifeedges from. Spherometer to measure curvature of a round surface. A screw passes through the centre of the tripod frame, parallel to the three legs. Measure the height of the curvature h for two watch glasses for a given distance s between the tips of the spherometer legs. The list of experiments include the practicals from physics and truly based ncert physics laboratory manual books. Physics practicals class xi r k maliks newton classes. Spherometer is an instrument for the precise measurement of the radius of a sphere. Measurement of youngs modulus by bending of beam method. Nov 22, 2016 to determine radius of curvature of a given spherical surface by a spherometer. Sep 14, 20 the least count for a spherometer of 100 equal divisions and of pitch 0. Simulator procedure as performed through the online labs click on the object shown on the left hand menu, to measure its thickness.
A formal report the effects of stress on business employees and programs offered by employers to manage employee stress prepared for dr. Spherometer, ball spherometer, ring spherometer, cylindrometer, cylindro spherometer, spherocylindrometer. To study the relationship between force of limiting friction and normal reaction and. A spherometer is an instrument for the precise measurement of the radius of a sphere.
To determine the value of acceleration due to gravity at a place with the help of katers pendulum. Brass dial head 40 mm diameter, mounted on stainless steel screw. Measurement of moment of inertia of different bodies and proof of parallel axis theorem. To measure diameter of a small sphericalcylindrical body using vernier callipers. Whilst reading an old textbook on mechanical vibrations, i came across one of those spinechilling examples you find in old textbooks and which commence with words nsider a spherical shell of radius r upon which is rolling without slipping a cylinder of radius r. Place the spherometer onto the plane mirror and verify the zero point of the scale. To write a physics lab report, start by putting together a cover sheet with your name, and the title and date of the experiment. The uncertainty in r determined in this way is the uncertainty for a single measurement multiplied by the square root of 3.
Coordinate geometric approach to spherometer 5 figure 3. Using the three points of the tips of the xed legs inbuilt in the construction of the spherometer and the choice of the coordinate system, we obtain d 0, u 12l, and v p 36l. Coordinate geometric approach to spherometer request pdf. To determine radius of curvature of a given spherical. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Here, we present the newly developed coordinate geometric approach and its applications. Dec 12, 2016 cbse practicals for class 11 physics lab manual work list of experiments to be performed for class 11 physics during practical exams in science subject. A spherometer for determining the radius of a basically circular cylindrical object such as a tube comprises first means defining a chord between two points of the circumference of a circle belonging to the crosssection of the object in the plane perpendicular to the axis of the part of the object whose basic geometrical form is a circular cylinder, second means for measuring the. Place the spherometer on the glass strip so that it rests between its three legs.
The usual form consists of a fine screw moving in a nut carried on the center of a 3 small legged. Students must know all the experiments along with theorems, laws, and numerical to understand all the concepts of 12th standard physics in a detailed way. The usual form consists of a fine screw moving in a nut carried on the centre of a small threelegged table or frame. Unit name 25 experiment any of the small divisions on the main scale. A largepcircular disc graduated with 100 equal parts is attached to the top of the screw. The distance covered by the circular disc in one complete rotation along the main scale. The following must be clearly written in the following order.
It works on the principle of micrometre screw section 2. Class xi radius of curvature by spherometer physics. Raise the central screw of the spherometer and press the spherometer gently on the practical notebook so as to get pricks of the three legs. Radius of curvature of a curved mirror is the radius of the sphere that was used to make it. Measure the distance between the pricks points by joining the points as to form a triangle abc. Click on the list to get the details of the experiments for lab manual works. How to use spherometer class 11 practical physics youtube. The mathematics and full description are in this 82k pdf.
A spherometer consists of a metallic tripod framework supported on three fixed legs of equal lengths. Measuring wavelengths with a diffraction grating dr. Sep 09, 2017 how to use spherometer to measure the thickness of an object. In a good instrument either screw gauge or a spherometer the thread on the screw and. Typically this is used for measuring lenses in physics labs to determine focal length and other geometrical optic measurements. In the second step the lens or test plate is put on the ring.
Coordinate geometric generalization of the spherometer article in far east journal of mathematical sciences 10. Apparatus a planeconvex lens of large radius of curvature, traveling microscope, optical arrangement for newtons rings, sodium lamp and a spherometer. Coordinate geometric generalization of the spherometer. Examine the spherometer, noting carefully that the legs and the vertical scale are not shaky and that the central screw is not very loose. Table 1 shows the different sections of a practical report and states the function of each section. Class 11 physics lab manual work ncert study rankers. Then, include an abstract, or summary of your report, followed by your objective, procedures, and methods. Determine the radius of curvature of a concave mirror using a spherometer. The spherometer used for measuring radius of curvature of spheri.
Guide shows you how to prepare a practical report and provides tips for ensuring a good grade. The term may also be spelled as a spheremeter or sphereometer. Carefully slide the indicator untill the small needle is pointing close to the 1. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens.
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