Doctor has prescribed a lens having power +1.8D. what will be the focal length of the lens? what is the type of the lens and what be defect of vision? please answer fast please answer

These are the refractive defects of vision because they are caused by the incorrect refraction of light rays by the eye-lens. These defects of vision can be corrected by using suitable spherical lenses (convex lenses or concave lenses). These lenses are usually used in the form of eye-glasses or spectacles.

Explanation:

answer: the correct answer is   air pressure at the top of mount everest is higher than at the bottom of the grand canyon.

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explanation:

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true