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Pune University - SY BSc (Sem - I) PHYSICS - II, April 2010

2 pages, 22 questions, 1 questions with responses, 1 total responses,    0    0
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Total No. of Questions : 4] P482 [Total No. of Pages : 2 [3717] - 204 S.Y. B.Sc. PHYSICS PH - 222 : Optics (Paper - II) (Sem. - II) (New) Time : 2 Hours] Instructions to the candidates: 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of calculator and log table is allowed. 4) Neat diagrams must be drawn wherever necessary. [Max. Marks : 40 Q1) Attempt all of the following : a) Define the terms, optical centre and principal focus of a convex lens.[1] b) State the cause of chromatic aberration. [1] c) Define angular magnification of a telescope. [1] d) What is diffraction of light? [1] e) State Malus law. [1] f) Two thin convex lenses each of focal length 20 cm are placed in contact. Find power of combination of lenses. [1] g) What do you mean by cardinal points? [1] h) A converging lens of power 25D is used as a simple microscope. Calculate the magnifying power, if the distance of distinct vision is 25cm. [1] i) What is meant by resolving power of an optical instrument? [1] j) Glass plate is to be used as a polarizer. Find the angle of polarization for it. ( for glass = 1.54). [1] Q2) Attempt any two of the following : a) Explain the construction and working of an astronomical telescope. Derive the expression for its magnifying power in normal adjustment. [5] b) Explain the stokes treatment of the phase change on reflection of light. [5] c) Explain Brewster s law and describe how it can be used to produce the plane polarized light. [5] P.T.O.

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Additional Info : S.Y. B.Sc. Physics (Semister - II), PH - 222 : Optics (Paper - II) (New Course), Pune University
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