In the Food Safety and Standards (Food Products Standards and Food Additives) Regulations, 2011 under the regulation 2.2: FATS, OILS AND FAT EMULSIONS in the category 2.2.1 OILS for the standards of coconut oil the parameter Refractive Index has been amended from the following, Refractive Index at 40oC:       1.4481-1.4491, Refractive Index at 40oC:     1.4480-1.4500. Many materials have a well-characterized refractive index, but these indexes depend strongly upon the frequency of light. • Finding the focal length of the combination: • Take a few drops of the given transparent liquid and place it on the surface of plane mirror. 4 0 obj Adjust the needle at a height a little more than the rough focal length of the convex lens. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength of 589 nanometers. The refractive index which is also known as the butyro value of animal and vegetable fats and oils. There are also weaker dependencies on temperature, pressure/stress, etc., as well on precise material compositions (presence of dopants, etc. Let it be x2. To generate a liquid lens , a liquid is sandwiched between two pieces of a clear plastic or a glass. The convex lens is placed over it as before. Characteristic Coconut oil Colour – Platinum cobalt scale (max) 50 Relative density at 40°C/20° C 0.908-0.921 Refractive Index at 40°C 1.448-1.450 Moisture & other volatiles at 105°C 0.1 Free fatty acids, calculated as lauric acid % by mass (max) 0.3 Peroxide value (millequivalents of active oxygen per kg) Not more than 15 Iodine value 6.3-10.6 Sap. This desirable property makes water a very suitable candidate for the production of liquid lens.Essentially the liquid must be transparent so as to study its effects. The draft regulations are in the process of being notified but the process of notification, the consideration of comments received by the FSSAI and the finalisation of these regulations is likely to take some time. ); for many … • Again measure the distance between tip and upper surface of the plane mirror. If we keep the mirror behind a lens and put an object at the focus point of the lens above it, the image of the object will form at the same focus point where the object is. St. Louis couple indicted for waving guns at protesters In optics, refractive index or index of refraction ‘n’ of a substance (optical medium) is a dimensionless number that describes how light or any radiation propagates through that medium.It is defined as. New Delhi, India-110015, Copyright © 2020 Auriga Research Pvt. However, inorder to address the issue of the food business operators to comply with the present standards of coconut oil for the said parameter and to harmonise with the international standards – Codex, it has been decided to implement this parameter with immediate effect. The theory behind liquid lens is based on the properties of one or more liquids to create magnifications within a small amount of space.The focus of a liquid lens is controlled by the surface of the liquid .Water normally forms a bubble shape when … Expert resources to help you understand and implement the requirements of FSSAI & Food Safety and Standards Act. This property has enabled the efficient use of liquid lens to find the refractive index of a fluid by this method. • To find the radius of curvature of the liquid lens. Oil (necessarily transparent) can also be chosen to be used as a fluid in a liquid lens system. 'SNL' had a live audience. Refractive index can also help to differentiate between the various oils and also to differentiate between different fats like butter and margarine. The refractive index which is also known as the butyro value of animal and vegetable fats and oils. Finally the refractive index of liquid lens is given by. x�\�r�u}���ʩAE����CȲh���v��H1�Ғ>ȟ����ݽW�\� U)Vq3}�{�k��9?��0?��ڢ4�P�í���`�]ss4��w���y;�h�ߣ㻣y��}a�z�����C��C^���M�gE>t�t2�#7Ǜ�'�*���lM�7������r�����f���A�*kS��i��jH�w���ۏ�>_ߙ�{4�Z7uS���������eD�m�l��DU�0�gySw����+��3x��#!�sT�i{rԻ���8�,G����3�c��p}f����'��>yЛz�����,q���&Ər�8� �8�gm��KR��zJ�ݙ�os�'�5�K • Bring the tip of the needle, at the vertical principal axis of the lens, so that the tip of the needle appears touching the tip of its image. (R of convex lens surface in contact). The surface profiles of the liquid determines the focal length of liquid lens system and how the liquid lens focusses light rays. ie are the angles of incidence of the ray crossing the interface between 2 medias with refractive indeces n_1 and n_2. The experiment described in this project is an effective and simple method of measuring the refractive index of any liquid (transparent) using a convex lens and plane mirror. The historically first occurance of refractive index was in Snell’s law of refraction. Filed Under: FSSAI Tagged With: Coconut Oil, FSSAI, Refractive Index, 3/15, Kirti Nagar Industrial Area, FBOs who manufacture coconut oil will have to comply with these amended parameters with immediate effect. In the draft amendments of the Food Safety and Standards (food Products Standards and Food Additives) Amendment Regulations 2019, the refractive index parameters had been proposed to be amended which were as follows. If it is an extended object, its image will be inverted and the size of image is same as that of the object. where’ c’ is the speed of light in vaccum and ‘v’ is the speed of light in a substance. Only few drops of liquid should be taken so that the liquid lens layer is not thick Sources of error : • The needle may not be properly horizontal, The distance x1 and x2 may not be essentially clean. What is the refractive index of coconut oil? • Move the needle up and down to remove the parallax between tips of needle and its image. Let it be (x1 ). Notre Dame president caught in WH coronavirus storm. .�0d�з&Ob΍L���pn{U���.qw앒NF�͗�����Hx؎ڈ�����V�Bsݓ�M�8���&}s�8ē��� >��fS]�׹h��,qփ �[Umʓ� �݁pQ�J��ʇJ�+k*��g��wm��6T� ��������֛\y�{/�^_Uz�� H:7���.0�b%6\���J���\�x@ؖp�·A��p'��I0^~��э�[H�� ���a�۶�){=�L>�ʊ���^n�0���+Ϭ�&���Y��Nؤ1��G��Z��G� $h�_�:����Y��eruc���]����N�]d��~V���xV�Ű���3[x�_����~��o� �"\�VF,�G�W�>^����^�0q��[q��/��!2�"���9��L�#��&�,�9�����{? The convex lens is turned towards a source such that, the required surface is away from the source the distance is to adjusted that the image is, formed on the side of the source. Refractive Index at 40 o C: 1.4480-1.4500. • Measure the distance between tip of the needle and upper surface of the lens by using a meter scale.