Human Eye and C...

Anil, an $$8^{th}$$ grade student, was asked to draw a figure explaining how the mammalian eye collects and focuses light, converting it into electrical signals. Which of the following flow charts correctly represents the process?

The ciliary muscles of eye control the curvature of the lens in the eye and hence and alter the effective focal length of the system. When the muscles are fully relaxed, the focal length is maximum. When the muscles are strained, the curvature of lens increases. That means, radius of curvature decreases and focal length decreases. For a clear vision, the image must be on the retina. The image distance is therefore fixed for clear vision and it equals the distance of retina from eye lens. It is about $$25\ cm$$ for a grown up person.
A person can theoretically have clear vision of an object situated at any large distance from the eye. The smallest distance at which a person can clearly see is related to minimum possible focal length. The ciliary muscles are most strained in this position. For an average grown up person, minimum distance of the object should be around $$25\ cm$$.
A person suffering from eye defects uses spectacles (eye glass). The function of lens of spectacles is to form the image of the objects within the range in which the person can see clearly. The image of the spectacle lens becomes object for the eye lens and whose image is formed on the retina.
The number of spectacle lens used for the remedy of eye defect is decided by the power of the lens required and the number of spectacle lens is equal to the numerical value of the power of lens with sign. For example, if power of the lens required is $$+3D$$ (converging lens of focal length $$100/3\ cm$$), then number of lens will be $$+3$$.
For all the calculations required, you can used the lens formula and lensmaker's formula. Assume that the eye lens is equiconvex lens. Neglect the distance between the eye lens and the spectacle lens.
A far sighted man cannot see objects clearly unless they are at least $$100 \  cm$$ from his eyes. The number of the spectacle lenses that will make his range of clear vision equal to an average grown up person will be

The process of re-emission of absorbed light in all directions with different intensities by the atom or molecule is called ____________.

What is the color of the emergent ray of light when two prisms are placed besides each other in a way that the second is inverted?

If red and violet colours are passing through the same glass sheet simultaneously then the relation between their velocities will be:

Sky looks bright from the earth on a sunny day but from any space station it is dark because

A man can see objects clearly up to $$3 m$$. What type of lens he should use in order to see clearly up to $$12 m$$?

A man can see distinctly from a distance of $$0.5 m$$. If he wants to read a book placed at a distance of $$25 cm$$, then what kind of lens should he use?

Read the given statements and mark the correct option.
Statement 1 : Abeam of white light gives a spectrum on passing through a hollow prism.
Statement 2 : Speed of light outside the hollow prism is different from the speed of light inside the hollow prism.

In Section A, defects of eye are given, in Section B, effects arising due to defects are given and in section C, remedies are given using lenses. Find the correct pair.