Question

A doctor prescribes a corrective lens of power -0.50 to a person. The focal
length of lens and the which type of lens type is
B. +2m and convex lens
A. -2m and concave lens
D. -2m and convex lens
c. +2m and concave lens
​

Answer 1

A. -2m and concave lens is the prescribes a corrective lens

Explanation:

1.Focal length of lens  f= $\frac{1}{p}$

$f=\frac{1}{-0.50}$=-2m, focal length of lens is negative, so the lens must be a concave lens.

2.​The focal length of a lens is determined when the lens is focused at infinity.

3.Lens focal length tells us the angle of view,how much of the scene will be captured and the magnification,how large individual elements will be. The longer the focal length, the narrower the angle of view and the higher the magnificatio

4.usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lenses, both the minimum and maximum focal lengths are stated, for example 18–55 mm.

Answer 2

Answer:

The correct option is A. -2m and concave lens

Explanation:

Given,

Power of the lens = -0.50 D

We know that,

power = 1/focal lenght

p = 1/f

-0.50 = 1/f

f = -1/0.50 m

f = -2m

Since the focal length is negative, the lens is concave that is it is diverging. This type of lens is used to cure myopia or nearsightedness

#SPJ2