The Human Eye and the Colourful World

Myopia is also known as short-sightedness in which the person finds difficulty in seeing objects that are placed nearby. This defect is corrected by using a diverging lens (concave lens). Following is the ray diagram of the correction of myopia: (a) The image is formed in front of the eye. (b) The far point of …

Explain with the help of labelled ray diagram, the defect of vision called myopia and how it is corrected by a lens. Read More »

Concave lens is used for correcting myopia. Following is the ray diagram of the correction of myopia: (a) The image formation for a myopic eye will happen in the front of the retina. (b) F is the far point of a myopic eye which is less than infinity. (c) The concave lens is placed in …

Name the defect of vision which can be corrected by a diverging lens. Show clearly by a ray diagram how the lens corrects the defects. Read More »

Convex lens is used for correcting hypermetropia. (a) Person suffering from hypermetropia, the image of the object placed nearby will form behind the retina. (b) N’ is the near point of hypermetropic eye which is farther away from the normal near point N. (c) Convex lens is used for correcting hypermetropia and a virtual image …

Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect. Read More »

Myopia is a condition in which a person can see objects placed close by but has trouble seeing those farther away. Hypermetropia, on the other hand, is the condition in which a person can see items that are far away but has trouble seeing objects that are close by. It is recommended that someone with …

Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How it help? Read More »

Myopia can be fixed with diverging lenses. The myopia correction ray diagram is shown below: (a) The front of the retina is where a myopic eye will form images. (b) F is the far point of a myopic eye which is less than infinity.

For the treatment of hypermetropia, convergent lenses are used. (A) A person with hypermetropia will construct an image of a close item behind the retina. (b) N’ is the near point of hypermetropic eye which is farther away from the normal near point N. (c) A virtual image of the item is created at the …

Name the defect of vision which can be corrected by a converging lens. Show clearly by a ray diagram how the lens corrects the defect. Read More »

Myopia is a condition in which a person can see objects placed close by but has trouble seeing those farther away. Hypermetropia, on the other hand, is the condition in which a person can see items that are far away but has trouble seeing objects that are close by. It is recommended that someone with …

Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How it help? Read More »

Myopia and hypermetropia, the two most common vision defects can be treated using concave and convex lenses, respectively.

(a) Myopia(b) Hypermetropia

(a) Hypermetropia (b) Myopia