Aconcave 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

A. 40 cm

Explanation:

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

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

b

step-by-step explanation: a third of 24 is 8, 8 times 3 is 24 so 8 - 2 would be 6

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.