Human Eye and C...

When objects at different distance are seen by the eye, which of the following remain constant?

The distance of the eye-lens from the retina is $$x$$. For a normal eye, the maximum focal length of the eye-lens

The eye forms a real and inverted image of an object on the retina. If the eye lens is defective, the image of objects may be formed in front of or behind the retina. Persons in whom the image is formed in front of the retina are not able to see the distant objects clearly while if the image is formed behind the retina the person is not able to see a near object clearly. The latter kind of people is said to be longsighted.
Persons suffering from myopia cannot see clearly the

A person A can clearly see object between 25 cm and 200 cm. Which of the following may represent the range of clear vision for a person B having muscles stronger than A, but all other parameter of eye identical to that of A?

What characteristic property of light is responsible for the blue colour of the sky?

During dispersion of white light by a prism, the red colour deviates :

An astronaut in a spaceship the sky appears black due to:

The power of spectacle for myopic eye is :

The image of an object is formed behind __________ in hypermetropia.