refraction of human eye

Mirage and Looming - The mirage is caused by the total internal reflection of light at layers of air of different densities. In a desert, the sand is very hot during day time and a result the layer of air in contact with it gets heated up and becomes lighter. The lighter air rises up and the denser..

The retina of our eye is composed of light sensitive cells. Light sensitive cells are of two types namely, rods and cones. There are three types of cones., those that are stimulated by low frequencies, those stimulated by intermediate frequencies and those stimulated by higher frequency v..

The eye works on the same principle as that of the camera. The light rays from the object pass through the conjuctiva, cornea, aqueous humour, lens and vitreous humour in that order. All these structures refract the light such that it falls on the retina. This is called focussin..

Summary - Ray optics is also called geometrical optics as it uses the geometry of straight-line paths (rays) to explain the optical phenomena. Ray optics, infact, is the limiting case of wave optics. This means for most practical purposes, we can ignore the deviation from straight-line path as post..

Polynuclear aromatic hydrocarbons enter the body quickly and go to the fat containing tissues. There is little data available for the toxic effects of naphthalene on humans. Short-term low exposure to naphthalene may cause eye and skin irritation. At slightly higher levels (abo..

It is a phenomenon where a given gene has multiple phenotypic effects. As a result, the gene not only influences the trait which it expresses, but also influences many other traits. Such a gene is called pleiotropic gene. Pleiotropic genes generally do not have the same influence on all the traits ..

Question: I Cannot remember my mother Only when from my bedroom window I send My eyes into the blue of the distant sky, I feel that the stillness of my mother's gaze on my face has spread all over the sky. a) Why do you think the poet looks out into the distant sky? b) Explain "I ..

Place a prism (P 1 ) on a table and a screen behind it. Allow a narrow beam of light to be incident on the prism (P 1 ). The white light gets dispersed and we obtain a band of seven colours on the screen. Now remove the screen and place another prism P 2 of the same material in the opposite d..

Host cells infected with viruses produce a protein called interferon . In humans, it has been shown to be produced by leucocytes and T-cells. Some virus - infected cells release this glycoprotein called interferon. It diffuses into uninfected neighbouring cells and induces these uninfec..

Sir Isaac Newton, while studying the images of heavenly bodies formed by a lens, found that the images were coloured at the edges. In 1665, to investigate this, he performed an experiment using a prism. Newton darkened his room at Trinity College, Cambridge and allowed a beam of sunlight to pass t..