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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. Q3) Attempt any two of the following : a) The focal length of each lens of Ramsden s eye-piece is 4cm. Calculate the equivalent focal length of eye-piece and locate the positions of cardinal points. [5] b) c) A soap film of refractive index 1 and of thickness 1.5 10-6m is illuminated by white light incident at an angle of 30 . The light reflected by it is examined by spectrometer in which is found a dark band corresponding to wavelength of 5 10-7m. Calculate the order of interference bands. [5] Unpolarized light falls on two polarizing sheets placed one on top of other. What must be the angle between the characteristic directions of the sheet if intensity of transmitted light is one fourth intensity of the incident beam? [5] Q4) Attempt the following : a) i) Derive the len s maker s formula for a thin len s. [4] ii) Show that longitudinal chromatic aberration is equal to the product of dispersive power and mean focal length. [4] OR i) ii) b) Explain principal foci and focal planes. Draw necessary ray diagram. [4] Explain how spherical aberration is reduced using plano convex lens. [4] Attempt any one of the following : i) Distinguish between fresnel s and Fraunhoffer s diffraction. [2] ii) Monochromatic light of wavelength 6000A is incident normally on a diffraction grating. The first order maximum is observed in the direction of 15'. Calculate the grating element. [2] vvvv [3717]-204 2

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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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