Why spectrometer has two vernier arrangements

In this position the spectrum of light can be obtained. Since t he spectrum is seen through the telescope and telescope is adjusted for minimu m deviation position for a particular color or wavelength in t he way give here- Set up telescope of a particular color and rotate the prism-table in one direction, the telescope should moved in such a way that to keep the spectral line in view.

By doing this, a position will come spectral line recede in opposite direction although the rotation of the table is continue in th e same direction. Now t he particular position, where the spectral line begins to recede in opposite direction is the minimum deviation position for that color.

N ote the reading of the two verniers. Remove the prism-table and bring the telescope in, the line of collimator. Now s ee the slit directly through the telescope and coincide the image of slit with vertical cross-wire. Again, n ote the reading o f the two verniers.

The difference between the minimum deviation position, and the direct position gives rise to the angle of minimum deviation for that color. Repeat the same procedure to obtain the angles of minimum deviation for other colo r s. Let us, see the following images:. Figure: 6. Left: Arrangement for determination of the angle of prim. Right: Arrangement for determination of the angle of minimum deviation. Result : The refractive index for the material of the prism is :. Seria no.

Calculated refractive index. Standard refractive index. Practical physics by Geeta Sanon. You are commenting using your WordPress. You are commenting using your Google account.

You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Email Address:. Skip to content. Collimator : It consists of a horizontal tube of variable length with an adjustment slit S at one end and a convex lenses at the other. Turn the grating to 45 degree so that it is at 90 degree to the collimator. Reset the telescope to see an image of the object.

Note the telescope vernier reading carefully. Diffraction of light. Experimental performance : Objective : To determine the refractive index of the material of Prism, using a Spectrometer. Measurement of angle of minimum deviations : Place the prism so that its centre should coincides with the centre of the prism-table and the light falls on, one of the polished faces and emerge d out of the other polished face s after refraction.

Result : The refractive index for the material of the prism is : Seria no. Share this: Twitter Facebook. Like this: Like Loading April 5, at am. Huzef UR Rahman says:. November 20, at pm. Method of taking total reading is wrong.. Anuja ghadi says:. December 10, at am. Ayoade Israel Abdul-Salam says:. But I am not sure of the machinery of the spectrometer so I might be wrong here.

Show 4 more comments. We are assuming that both the scales move independent of each other about their axes. Talk about the error due to offset From the figure given bellow : The outer markings are of the main scale. The purple lines represent extended the markings on the vernier scales. Here only 0 and 10 of both scales are shown.

The measured value at is different from the true value since the vernier's zero marking points to marking This error in vernier 1 and vernier 2 is unchanged if the main scale is rotated, since only the markings change, the line of offset is at the same angle with vernier scales. When finding any angle, we take the difference between two measured values at different positions of the telescope. This should not affect the vernier scale and therefore the error in both measured values will be equal resulting in no error due to offset in the measured angle which obtained by taking the difference of the readings.

In the case where the vernier table is rotated to measure the angle, the mean of the angles measured by vernier 1 and vernier 2 will minimise the systematic error in measurement but it will not eradicate it completely.

Conclusion The systematic error in measurements from V1 and V2 will be completely erased if difference of any two measurements is taken which we always do while measuring angles.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Featured on Meta. Now live: A fully responsive profile. Related 8. Meridians are just lines of longitude from the North to South poles so there can be an infinite number of meridians.

A map can show a meridian at whatever interval is appropriate. Some maps of the world show meridians at every 15 degrees and others every 10 degrees. A map of a region may, for example, be spaced 1 degree apart so the number of degrees apart depends on the scale of the map. The nails are apart of the bodies Integumentary system.

This system is responsible for protecting the body from damage. The components include skin, hair, scales, nail, sweat glands and their products sweat and mucus. An exterior angle of an octagon can have any value between 0 and degrees apart from degrees.

The Equator is 0 degrees latitude. The degrees of latitude are approximately 69 miles kilometres apart. Just 20 degrees south of the equator. That depends on the scale of the map you use. We can measure them as finely as you want to. There are an infinite number of lines of latitude and longitude. It depends on what sort of map you are looking at. A map of the world may show lines 10 or 15 degrees apart. A map of a country may show lines 2, 5 or 10 degrees apart.

A map of a region within a country may show lines 1 degree or 30 minutes apart. A map of a local area such as a city, may show lines minutes and seconds apart. Fish have scales. Seals are much larger than fish and have a slippery body and a little face :. An exterior angle of any polygon can have any value between 0 and degrees apart from degrees. Short answer, no. Three phase line voltage is degrees apart in separation.

Single phase is degrees apart. To maintain the injected voltage at 90 degrees to the single phase voltage would be nearly impossible to control. Log in. Commas Colons and Semicolons. Study now. See Answer.

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