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Answer:
Total focal length of convex lens is (d) +15cm
Explanation:
Here 1/f = 1/v- 1/
when we calculating each and every observation getting the value +15 cm
the maximum repeated value is the answers 1/f= 1/18 - 1/(-90) = 1/15
Similarly 1/f= 1/20- 1/(60) = 1/15. = + 15 cm.
so that f = +15 cm
when oject distance is more image an not be clearly visible and errors may also have a chance be taken. So that we are taking most accurate answers.
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