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ISC Board Exam 2014 : Physics Paper 2 (Practical) with Model Answers

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi

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PHYSICS PAPER 2 (PRACTICAL) Answer all questions. You should not spend more than one and a half hours on Question 1. Question 1 [10] This experiment determines the focal length of the given convex lens by no parallax method. You are provided with: (i) A lens holder (ii) A convex lens (iii) Two optical pins (iv) An optical bench Note: The experiment may be performed on a table top, using a metre scale, in case an optical bench is not available. Mount the given convex lens (L) on the lens holder. Adjust the heights of object pin (O) and image pin (I) till their tips lie on the principal axis of the lens. Now, arrange them as shown in Figure 1: I O 0 cm L I v u 100 cm Figure 1 Object pin (O) is at zero cm mark and the lens (L) is at 70 cm mark so that the object distance (OL) = u = 70 cm. Look at the tip of the object pin, through the lens, from a distance. You will see a diminished and inverted image (I ) of the object pin. Now, adjust the position of the image pin (I) till it coincides with I . Thus, there is no parallax between I and I. Ensure that tip to tip parallax is removed. Note this position (I) of the image pin and determine the image distance v = LI, correct up to one decimal place. Show this reading to the Visiting Examiner. Calculate q = uv u v and p = , both up to one decimal place. 100 10 Now, repeat the experiment for five more values of u in the range 20 cm to 70 cm. Each time, find v and calculate p and q. 27

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Additional Info : ISC 2014 : Board Model Answers (Physics Paper 2)
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