Analyse the following observation table showing variation of image


Analyse the following observation table showing variation of image distance (v) with
object distance (u) in case of a convex lens and answer the questions that follow, without doingany calculations,
Object distance.image.distanc(u) cm.(v)cm-90. 18-60. 20-30. 30-20. 60-18. 90-10. 100
a) What is the focal length of the convex lens? Give reason in support of your answer.b) Write the serial number of that observation which is not correct. How did you arrive atthis conclusion?c) Take an appropriate scale to draw ray diagram for the observation at serial No.4 and findthe approximate value of magnification.​


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