Answer:
Explanation:
Power of a lens is the reciprocal of its focal length. It is measured in dioptres (D). Mathematically;
[tex]P = \frac{1}{f}[/tex]
f is the focal length of the lens
Given
Power of the lens = -1.5D
Substitute into the formula;
[tex]f = \frac{1}{D} \\f = \frac{1}{-1.5}\\f = -0.67 cm[/tex]
Hence the focal length of the eye lens for her to see clearly should be 0.67cm (concave lens)
