Question

State two main causes of a person developing near sightedness. With the help of a ray diagram suggest how he can be helped to overcome the disability?

Answer 1

Answer:

The defect is myopia and the two causes are:-

(I) The eye ball become elongated

(ii) Focal length decreases

It can be corrected by using a concave lens of suitable power.

Answer 2

The defect is myopia and the two causes are:-

(I) The eye ball become elongated

(ii) Focal length decreases

It can be improved by convex lens.

Convex lens:

• It is the amount of an image concerning the proportion of the object devising it. Linear (occasionally named lateral or transverse) praise refers to the percentage of countenance distance to object time measured in planes that are at right angles to to the unobstructed path.

• A negative worth of undeviating praise means an inverted representation. Longitudinal praise designates the determinant by which an image increases in intensity, as calculated ahead the unobstructed path. Angular praise is equal to the percentage of the digression of the angles subtended by an object and allure figure when calculated from a given point in the means, as accompanying magnifiers and small binoculars.

• There is no hypothetical limit in consideration of magnification attainable in an ocular method, but experienced praise is limited apiece arrangement’s deciding power—i.e., allure skill to form discernible images of objects divided by narrow bent distances.

• A part of praise commonly secondhand in microscopes and telescopes is the width, the praise in diameters being prepared the number of periods the linear ranges of the object are raised.

Learn more about Convex mirror on:

brainly.in/question/924964

brainly.in/question/7267709

#SPJ3