☰ Contents · Physics

Lenses and image construction

Lessons 54–55 · 2 lessons · P. Habibullayev, A. Boydedayev, A. Bahromov, K. Suyarov, J. Usarov, M. Yuldasheva. Physics Grade 9, revised and expanded 3rd edition. G‘afur G‘ulom Publishing House, Tashkent, 2019
Answers are for parents and teachers.
1
What is the optical power in dptr of a lens with focal length 25 cm?
2
A lens has optical power 2.5 dptr. What is its focal length in cm?
3
F = 15 cm, d = 30 cm. Find f and Γ.
4
F = 12 cm, d = 18 cm. Find f.
5
What kind of image does a camera lens give of a distant object?