Human Eye and C...

The nearer point of hypermetropic eye is 40 cm. The lens to be used for its correction should have the power?

In the given figure, if P is a point of the source of light, R is retina and L is the lens of the eye, the person having such condition of his eyes is suffering from :

Which of the following statements is correct concerning the passage of white light into a glass prism?

Of the following natural phenomena, tell which one is based on the refraction of light:

A ray of light containing both red and blue colours is incident on the refracting surface of a prism. Then,

A person cannot see object clearly that are closed that $$2m$$ and father than $$4m$$ . To correct the eye vision the person will use :

A man wearing glasses of focal length + 1m cannot clearly see beyond 1 m

To remove myopia (short-sightedness) a lens of power $$- 0.66D$$ is required. The distant point of the eye is approximate.

A man wearing glasses of power $$+2D$$, can read clearly a book placed at a distance of $$40\ cm$$, from the eye. The power of the lens required, so that he can read at $$25\ cm$$ from the eye is ?

A far-sighted person cannot focus distinctly objects closer than 120 cm. The lens that will permit him to read from a distance of 40 cm will have a focal length: