Question

for what object distance is a corresponding image distance not correct how did you arrive at this conclusion
DEVILSLATHER N LUV KAPOOR MENE DALI ISLIYEEE...​

Answer 1

a. From observation 3 image distance = object distance so radius of curvature = 40 cm so focal length is half of the radius of curvature = 20 cm b. Observation 6 is not correct as the object is placed between optical center and focus so the image will be erect and virtual. so image distance will not be positive.