Question

Calculate the power of a concave lens with negative focal length of -0.66 of a metre. You must show your workings within your answer to this question.

Answer 1

Explanation:

Sure, I'd be happy to help with that. The power of a lens is given by the reciprocal of its focal length. The focal length must be in meters for the power to be in diopters, the standard unit of lens power. Here's the formula:Power (P) = 1 / Focal length (f)Given that the focal length (f) is -0.66 meters, we can substitute this into the formula:P = 1 / -0.66

This gives us a power of approximately -1.52 diopters. The negative sign indicates that the lens is diverging, or concave. So, the power of a concave lens with a focal length of -0.66 meters is approximately -1.52 diopters.