Question

1. I am nearsighted and looking for contact lenses which will correct my vision. I should select:
a. A diverging lens, characterized by a negative focusing power
b. A converging lens, characterized by a negative focusing power
c. A diverging lens, characterized by a positive focusing power
d. A converging lens, characterized by a positive focusing power

2. I have a glass lens (index of refraction 1.5) with a concave side with radius of curvature 2 m and a convex side with radius of curvature 1 m. Select the best description of the lens:
a. Diverging lens with |f|=1.33 m
b. Diverging lens with |f|=4 m
c. Converging lens with |f|=1.33 m
d. Converging lens with |f|=4 m

3. Select the option which is NOT one of the three easy rays for a converging lens
a. A parallel ray which passes through the lens and through the focal point on the opposite side from the object
b. A ray which passes through the focal point on the same side as the object and is bent to parallel by the lens
c. A ray which passes through the center of the lens and is not bent at all
d. A ray which travels straight from the object to the focal point on the opposite side from the object

Answer 1

3) A ray which travels straight from the object to the focal point on the opposite side from the object

is NOT one of the three easy rays for a converging lens

1)

Nearsightedness — the condition where a person can see near objects clearly but distant vision is blurred — typically is easily corrected with prescription eyeglasses or contact lenses.

Lenses used to correct nearsightedness are concave in shape. In other words, they are thinnest at the center and thicker at the edge.

These lenses are called "minus power lenses" (or "minus lenses") because they reduce the focusing power of the eye. By doing so, minus lenses move the focus of light in a nearsighted eye from a point in front of the retina backward so it falls directly onto the surface of the retina. This shift corrects the blurry distance vision caused by myopia, restoring clear vision.

2)

her n = 1.5

R 1 = -2 and R2 =-1

lens is converging with |f| = 4

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