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Can there be displacement of an object i...

Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

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Analyse the observation table which shows variation of image distance [v] with object distance [u] in the case of a convex lens. Answer the questions that follow without doing any calculations. {:("Sl.No","Object distance","Image distance"),(,"u [cm]","v [cm]"),(1,-90,+18),(2,-60,+20),(3,-30,+30),(4,-20,+60),(5,-18,+90),(6,-10,+100):} (a) What is the focal length of the convex lens ? Given reasons to support your answer. (b) Write the Sl.No of the observation which is not correct. How did you arrive at this conciusion ? (c ) Use an appropriate scale to draw the ray diagram for the observation at Sl. No 4 and find the approximate value of magnification.