Without glasses, your uncle Albert can see things clearly only if they are between 26.9 cm and 129 cm from his eyes. What power eyeglass lens will

Without glasses, your uncle Albert can see things clearly only if they are between 26.9 cm and 129 cm from his eyes. What power eyeglass lens will correct your uncle's myopia? Assume the lenses will sit 1.77 cm from his eyes.