AIIMS 2019 Physics Lens Power MCQ Question

When using spectacles, the power required is calculated considering the distance from the lens to the eye, which is approximately 2 cm in this case. The formula for lens power (P) is given by P = 1/f, where f is the focal length in meters. For contact lenses, which sit directly on the eye, the effective distance is reduced, leading to a required power of approximately -4.54D, as calculated by adjusting the original power for the distance change (using the lens maker's formula). Options A, C, and D are incorrect because they do not accurately reflect the necessary adjustment for the reduced distance of contact lenses compared to spectacles.