☰ Contents · Physics

Lens problems and the optical power lab

Lessons 56–57 · 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
F = 10 cm, d = 40 cm. Find f (cm, fraction).
2
d = 60 cm and f = 20 cm. Find F.
3
For a lens d = 20 cm, f = 60 cm. Find Γ.
4
An object is 30 cm from a lens of power 5 dptr (F = 20 cm). Find f.
5
Why does an image still form if the lens centre is covered, only dimmer?