Question

Your camera's zoom lens has an adjustable focal length ranging from 77 to 224 mm. What is its range of powers

Answer 1

Answer:
`0.446\ D\ \text{to}\ 1.298\ D`

Step-by-step explanation:

Given

Camera has an adjustable focal length ranging from
`77` to
`224` mm

Power is given by Reciprocal of focal length in meter

Power corresponding to 77 cm

`\Rightarrow P=(1)/(0.77)\\\\\Rightarrow P=1.298\ D`

Power corresponding to 224 cm

`\Rightarrow P=(1)/(2.24)\\\\\Rightarrow P=0.446\ D`

Therefore, the range of the power is
`0.446\ D\ \text{to}\ 1.298\ D`