Question

The focal length of a concave lens 13.3 cm.Calculate its power.​

Answer 1

`\boxed{\sf Power \ of \ the \ lens = 7.5 \ D}`

Given:

Focal length of concave lens = -13.3 cm = -0.133 cm

To Find:

Power of lens

Step-by-step explanation:

Formula:

`\boxed{ \bold{Power \: of \: the \: lens = (1)/(Focal \: length \: of \: the \: lens \: (m))}}`

By submitting value of focal length we get:

`\sf Power \: of \: the \: lens = (1)/(0.133) \\ \\ \sf \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 7.5 \: Dioptres`