+1 vote
in Physics by (672 points)

 A glass lens is immersed in water. How is the power of the lens affected

Please log in or register to answer this question.

1 Answer

+1 vote
by (21.3k points)

For a glass lens in air, n2=1.5, n1=1

For a glass lens in water: n1=1.33


let: (1/R1)-(1/R2)=X

1/f in water =(1.5/1.33  -1)X

            nearly =1/4 X

so the focal length of the lens becomes 4 times when immersed in water.

so power becomes 1/4 th

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.