0 votes
156 views
in Physics by (71.7k points)
closed by
When is linear magnification of a convex lens positive and when is it negative? What should be the corresponding distance of the object from convex lens of focal length 50 cm?

1 Answer

0 votes
by (71.8k points)
selected by
 
Best answer
Linear magnification of a convex lens, `m=("size of image" (h_(2)))/("size of object" (h_(1)))=(v)/(u)`
Talking `h_(1)` as positive, magnification (m) will be positive, when `h_(2)` is positive, i.e., image is erect and virtual. This happens when object distance (u) from the lens is less than focal length `(f =50 cm)` of the convex lens.
Again magnification (m) will be negative, when `h_(2)` is negative, i.e., image is inverted and real. This happens when object distance (u) from the lens is more than the focal length `(f =50 cm)` of the lens.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...