The figure shows a doublet lens in which the positive lens and the negative lens are both manufactured from flint glass and have the same radius of curvature. The focal length of the negative lens is -50.8 cm, and the focal length of the positive lens is 50.8 cm. The combined focal length of the doublet is
A) -25.4 cm
B) 25.4 cm
C) -102 cm
D) 102 cm
E) infinite.

Question

The figure shows a doublet lens in which the positive lens and the negative lens are both manufactured from flint glass and have the same radius of curvature. The focal length of the negative lens is -50.8 cm, and the focal length of the positive lens is 50.8 cm. The combined focal length of the doublet is
A) -25.4 cm 
B) 25.4 cm 
C) -102 cm 
D) 102 cm 
E) infinite.

Quizplus · Accepted Answer

The Answer of  The figure shows a doublet lens in which the positive lens and the negative lens are both manufactured from flint glass and have the same radius of curvature. The focal length of the negative lens is -50.8 cm, and the focal length of the positive lens is 50.8 cm. The combined focal length of the doublet is
A) -25.4 cm 
B) 25.4 cm 
C) -102 cm 
D) 102 cm 
E) infinite.

The Figure Shows a Doublet Lens in Which the Positive