Question

Your camera’s zoom lens has an adjustable focal length ranging from 80.0 to 200 mm. What is its range of powers?

a) 0.0125 to 0.025 D
b) 0.005 to 0.0125 D
c) 0.025 to 0.0125 D
d) 0.0125 to 0.005 D

Answer 1

The range of powers for the camera's zoom lens is 12.5 D to 5 D.

Step-by-step explanation:

The power of a lens is given by the formula:

Power (P) = 1 / focal length (f)

Where the focal length is given in meters. To convert 80.0 mm and 200 mm to meters, we divide by 1000. So, the range of powers for the camera's zoom lens is:

P = 1 / (80.0/1000) to 1 / (200/1000)

= 1 / 0.08 to 1 / 0.2

= 12.5 D to 5 D

Therefore, the range of powers for the camera's zoom lens is 12.5 D to 5 D.