LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in Physics by (38.0k points)
closed by

A dense glass double convex lens (n = 2) designed to reduce spherical aberration has |R1| : |R2| = 1:5. If a point object is kept 15 cm in front of this lens, it produces its real image at 7.5 cm. Determine R1 and R2.

1 Answer

+1 vote
by (39.6k points)
selected by
Best answer

Given: |R1| : |R2| = 1 : 5, u = -15 cm,

v = +7.5 cm, n = 2

To Find: Radii of curvature of double convex lens (R1) and (R2)


Calculation: From formula (i),


∴ f = +5 cm

Substituting this value in formula (ii), we get,

By sign conventions,

Substituting in equation (1),

∴ R1 = 6 cm

Using in equation (2),

R2 = 5 × 6 = 30 cm

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.