contestada

A concave mirror with a radius of curvature of 20 cm has a focal length of

A. 40 cm
B. 20 cm
C. 10 cm
D. answer depends on the index of refraction of the air around the mirror

Respuesta :

skyluke89

Answer:

A. 40 cm

Explanation:

For a curved mirror, the focal length is twice the radius of curvature of the mirror. In formula:

[tex]f=2R[/tex]

where

f is the focal length

R is the radius of curvature

The concave mirror in this problem has a radius of curvature of

R = 20 cm

so, its focal length is

[tex]f=2R=2(20 cm)=40 cm[/tex]

Otras preguntas