Question

Analyse the following table showing variation of image distance () with object distance (u) in case of a convex lens and answer the questions that follow (Question 4 & 5) S. No. Object Distance (u) cms Image Distance (v) cms 1. - 60 • 12
2. - 30 + 15
3. - 20 + 20
4. - 15 + 30
5. - 5 + 10
Write the serial number of the observation which is not correct.​

Answer 1

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Answer 2

Answer:

1.From the observation 3, we can say that Radius of curvature is 40cm so foal length of the convex lens is 20cm.[f=R/2]

2. Observation 6 is incorrect , as the object is in between P and F, the image formed will be virtual image on the same side of object, image distance should be negative.

3.Ray diagram for observation 3: Please refer attachment : object beyond C

4. magnification=m=v/um=30/-60=-1/2= -0.5so the image is real, inverted and diminished.