Human Eye and Colourful World Test - 1

Explanation:

The far point  is  infinity  for  normal  eye.  It  is  the farthest  point  upto which  the  eye  can see object clearly.

Explanation:

When ray of light enters from a rarer medium (air) into a denser medium (water), it bends towards normal at the point of incidence.

Explanation:

Retina works like a screen or camera film. Retina is full of light and colour sensitive cells. These cells, upon receiving image send electrical signals to the brain, which processes these information to make a mental image of what we see.

Explanation:

If you mix red, green, and blue light, you get white light. Red, green, and blue (RGB) are referred to as the primary colors of light. This is additive color system. As more colors are added, the result becomes lighter, heading towards white. RGB is used to generate color on a computer screen, a TV, and any colored electronic display device.

Explanation:

The refractive index is a measurement of optical density. A medium with a low optical density, would have also a low refractive index.

Explanation:

As we become old,  the power of accommodation of  the eye usually decreases, the near point gradually  recedes away. This defect is called Presbyopia. Person may suffer from both myopia and hypermetropia.

Correction- Using of Bifocal  lens with appropriate power. Bifocal  lenses consist of both concave and convex  lens, upper position consist of concave  lens and  lower portion consist of convex  lens.

Explanation:

Electromagnetic waves (or electromagnetic radiation) are waves made of oscillating magnetic and electric fields, and include radio waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays. Thus, light is just one part of the electromagnetic spectrum, the part that our eyes can see.

Explanation:

The pupil of an eye provide a variable aperture, whose  size  is controlled by iris

a) When the light is bright: Iris contracts the pupil, so that less light enters the eye.

b) When  the  light  is dim:  Iris expand  the pupil,  so  that more  light enters  the eye. Pupil open completely, when  iris  is  relaxed.

Explanation:

Frame rate (expressed in frames per second or fps) is the frequency (rate) at which consecutive images called frames are displayed in an animated display. The human eye is capable of differentiating between 10 and 12 still images per second before it starts just seeing it as motion. That is, at an FPS of 12 or less, our brain can tell that its just a bunch of still images in rapid succession, not a seamless animation. Once the frame rate gets up to around 18 to 26 FPS, the motion effect actually takes effect and our brain is fooled into thinking that these individual images are actually a moving scene. The current industry standard is 24 FPS.