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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Neeraj bangruwa
ans.
no it's postive for concave
focal length is positive
https://web.pa.msu.edu/courses/2000fall/phy232/lectures/lenses/review.html
read it , it will beneficial for you.
sir isme object C and f ke bich rkha hai toh image always down to principle axis but ans + kyu??
ans -4 cm hone chahiye????
how???? for concave lens the focal length is positive?? and negative for convex
I'm more confused after this