The Moon’s Surface


“The first thing that you’ll notice when you look at the moon’s surface are the dark and light areas. The dark areas are called maria. The maria cover only 15 percent of the lunar surface.The remainder of the lunar surface

Phases of the Moon


“The revolution of the Moon around the Earth makes the Moon appear as if it is changing shape in the sky. From Earth we see the Moon grow from a thin crescent to a full disk (or full moon) and

The Moon


“The Moon is Earth’s only natural satellite. Although not the largest natural satellite in the Solar System, it is, among the satellites of major planets, the largest relative to the size of the object it orbits. It is the second-densest

What is the Braille System?


“Braille is a tactile writing system used by the blind and the visually impaired. It is traditionally written with embossed paper. Braille characters are small rectangular blocks called cells that contain tiny palpable bumps called raised dots. The number and

Blind spot


A blind spot, scotoma, is an obscuration of the visual field. A particular blind spot known as the blind spot, physiological blind spot, blind point, or punctum caecum in medical literature, is the place in the visual field that corresponds

Care of the Eyes


“We can take care of eyes as follows: 1) When playing sports, always use the proper eye protection, such as goggles, helmets, or visors. 2) Eyes are made to see only certain kinds of light, and the sun is just

What is inside Our Eyes


“The eye is a slightly asymmetrical globe, about an inch in diameter. The front part of the eye includes iris, cornea pupil, sclera, conjunctiva. Just behind the iris and pupil lies the lens, which helps to focus light on the

Sunlight — White or Coloured


“Sunlight is made up of a mixture of red, orange, yellow, green, blue, violet and indigo. These colours are the same as that of a rainbow. A prism can be used to see all the colours of the sun. When



“A kaleidoscope is a cylinder with mirrors containing loose, colored objects such as beads or pebbles and bits of glass. As the viewer looks into one end, light entering the other creates a colorful pattern, due to the reflection off

Reflected Light Can be Reflected Again


“Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. A periscope works by

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