Question
Physics Question on Refraction At Spherical Surfaces And By Lenses
A double concave lens of refractive index 1.5 with its two spherical surfaces of radii R1 = 30 cm and R2 = 45 cm is kept in air. Its focal length is
A
15 cm
B
37.5 cm
C
-18 cm
D
-36 cm
Answer
-36 cm
Explanation
Solution
The correct option is (D): -36 cm