Question

Find the focal length of biconvex lens

Answer 1

Answer:

20 cm

Explanation:

happy independence day

Answer 2

Answer:

1 like please

Explanation:

10 cm. B.

15 cm. C.

20 cm. D.

30 cm. MEDIUM. Answer. From lensmaker's formula, f1=(μ−1)(R11−R21) 201=(1. 5−1)(R1−(−2R)1) 201=21×2R3. R=15cm. ∴ length of radius =(2R)=2×15 cm=30 cm.