@�_�� �:����� u��x��j�� The reflected light then emerges into air along EF which is parallel to BC. Assume the plate have the same thickness t and wavelength of light 480 nm. Thin Film Interference When light hits a surface, it can be absorbed, transmitted or reflected. You might like to Young’s double slit experiment. @�_�� �:����� u�����ߗ���� �L�����������>�����է�-�����ԗ��� w+^/����`C���@\���s .��2��y4.���Ӌ�i��B�? Consider a transparent thin film of uniform thickness t and its refractive index µ bounded by two plane surfaces K and K′ as shown in figure. BME, sin i = BM/BE   [? In Young's... About Us | u��}�����_����?��� �;���? The only strong reflection occurs at 453 nm, which corresponds to the blue-violet region of the spectrum. ����� �����? A soap bubble 250 nm thick is illuminated by white light. u�� @�_� P��`g��@,�[��~,��Х_O 9���o��� .B�� ���� �:��� ���� �c���_�~����������C�m��� � �_� P���� ԡ��? Refund Policy, Register and Get connected with IITian Physics faculty, Please choose a valid Pay Now | Use Coupon: CART20 and get 20% off on all online Study Material, Complete Your Registration (Step 2 of 2 ), Live 1-1 coding classes to unleash the creator in your Child, Interference due to the Transmitted Light. Since the reflection at B is at the surface of a denser medium, there is an additional path difference λ/2 . subject, he brilliant colours exhibited by a thin oil film spread on the surface of water, A ray of monochromatic light AB incident on the surface K of the film is partly r, The effective path difference in this case, δ = 2µt cos r +, These are the only wavelengths close to the visible region of the electromagnetic spectrum for which destructive interference occurs. name, Please Enter the valid u���o��������?��O���� ���� �C�� ���� �:��� �����s��}�� ���������g�-��. 1 0 obj The soap film will, therefore, possess a pronounced blue colour. The path difference between the transmitted rays DG and HJ is, in a similar way, δ = 2µt cos r. In this case there is no additional path difference introduced because both reflections at the point D and E take place backed by rarer medium. (� �_� P���� ԡ��? The point on the screen where the central maximum fal before the glass plate was inserted, is now occupied by what had been the fifth bright fringe was seen before. When viewed in white light, soap bubbles show colours, because of. Click here to refer the most Useful Books of Physics. ?�K��_�����~~���c����9�����7�O��C�2�~�9��L���2� stream endobj ��2}��b�V�P����ҖԎ�A�Bլzk�Qus[M�т��^y��-�����^-�v�g �O�խ��Jm7����1+�e7i����ǀ u�� @��O������������������}5 `L�� ���� �:��� ���� �#�����V���5�? Sitemap | endstream BDL, sin r = BL/BD = (1/2 BE)/BD. ԡ������� ����_�?��W�>����5��y���! askiitians. One slit of a double slit experiment is covered by a thin glass plate of refractive index 1.4, and the other by a thin glass plate of refractive index 1.4, and the other by a thin glass plate of the refractive index 1.7. For getting an idea of the type of questions asked, refer the  Previous Year Question Papers. Franchisee | Clearly, both wavelengths correspond to light which is invisible to the human eye. The optical properties of thin films arise from interference and reflection. Careers | If light is incident normally i = 0 and hence r = 0. u�� @�_� PG�������!�L��9�� �K�����'�A@\� ���� �:��� ���� �C�� ��߾�L�߯�%�g� m�����?���˾� 0���? Interference of light by parallel sided thin film. It’s an easier way as well. Here interference takes place between rays reflected from the upper and from the lower surface of the film. askIITians GRIP(Global Rendering of Intellectuals Program)... All You Need to Know About the New National Education Policy... JEE and NEET 2020 Latest News – Exams to be conducted in... CBSE Class 12 Results Declared | Here’s How You Can Check Them. Interference in Thin Films, 5 •Two factors influence interference •Possible phase reversals on reflection •Differences in travel distance •The conditions are valid if the medium above the top surface is the same as the medium below the bottom surface •If the thin film is between two different media, one of lower index than the film and one of FAQ's | where n = 0, 1, 2, 3 … and the film appears dark. Everyone is familiar with the brilliant colours exhibited by a thin oil film spread on the surface of water and also by a soap bubble. u�� @�_� P�����_^�?\� ����9A���E���O/�n����� ����� ��F� p���� ԡ��? u�� @�_� P���� Ա��?e����~� `������_� n���� ԡ��? <>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> A ray of light travelling in air and getting reflected at the surface of a denser medium, undergoes an automatic phase change of π (or) an additional path difference of λ/2. The only strong reflection occurs at 453 nm, which, Structural Organisation in Plants and Animals, French Southern and Antarctic Lands (+262), United state Miscellaneous Pacific Islands (+1), Displacement of Fringes in Youngs Double Slit Experiment. N��El)ƫ�y��0�{)`�.s�!�� BR 1 → Light reflected from the upper surface of the film. 5 0 obj P�����_� u�����? jJ�@�:^��"�y4.���Ӌ��vl>�� h�����3 �������� /G���K?� �������� �/����ρ���ρ���O/m�����`�9���? ԡ������� ����_��� u��������:�������/�����������)������������{s|�G�@�_�W����~��o?�Qk�������x�gU�����'����O_���Vo^� Di��s F�x�΁�b�;6,����c���E���΁xt���O��� L���_�� ������� ����_�� ������W�~���O�5���׮�[���?8����i���������;ku�'��� 7 ~`8�f���E�@�9pȁ����s .�W�t|�I��?2����ׁ��?7n��㓼����� �O������:������ �C������:������_�z�{|�g��}��?�A���?�#���_��X�� ������W���P�?�l��>�o�߾�_������CҚ�i���`������ �s�99/���x�E0;�"H�?J�v��I�@�:^i�GS�@�90X� `������ ����_�� ������� ������U����C8���T��*���5�j�/�թ�x�'>������i�K�V wI�� ���� �:��� ���� �����}��3����oO�� �(��� �C�� ���� �:��� ����_��� �l���� ���� @�_� P���� ԡ��? BC and EF are reflected rays parallel to each other and DG and HJ are transmitted rays parallel to each other. Falling Behind in Studies? It follows that the only non-reflected colour is, A wavelength of 272 nm lies in the ultraviolet region whereas 1360 nm lies in the infrared. Terms & Conditions |

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