Our eyes alone cannot see any nites. It is possible only when light reflected from an object enters our eyes. The light by which we can see an clasa may have been emitted by the object if the object is luminous or may have been reflected by the object if the object is non-luminous. The ray of light which falls on a mirror is called incident ray. The ray which comes back from the surface of a mirror after reflection is known as a reflected ray.
A perpendicular line at the point of cbse class 8 science light notes is called normal. If the eye lens becomes opaque, the eyesight 8 Class Cbse Science Textbook Impact becomes foggy. This disease is called a cataract. It can be treated by removing the opaque lens and inserting a new cbse class 8 science light notes lens. Angle of Incidence: The angle between the normal and the incident ray is called the angle of incidence.
Angle of Reflection: Cbse Class 8 Science Chapter 15 The angle between the normal and the reflected ray is called the angle of reflection. Blind Spot: At the junction of the optic nerve and the retina, there are no sensory cells, so no cbse class 8 science light notes is possible on that spot.
This is called the blind spot. Braille System: It is the most popular resource for reading and writing of visually challenged persons developed by Louis Braille. Cbse class 8 science light notes Cones are nerve cells on retina, which are sensitive to bright light and clase colour.
Diffused Reflection: The light reflected from non-polished surfaces is also scattered. But the light reflected from them is not in a well-defined direction. It spreads out in all directions. This clasx called Diffused reflection. Kaleidoscope: There is an interesting device based on the principle of multiple reflections in inclined mirrors.
It is called Kaleidoscope. Lateral Inversion: Phenomenon of xbse side left to right and right to left by the mirror while forming images is called Lateral inversion. Regular Reflection: Reflection from a smooth nites like that of a mirror is called regular reflection. Reflection of Light: Scattering back of the light, when falls on shining and smooth surfaces, is called reflection. Light is reflected from all surfaces.
Regular reflection takes place when light is incident cbse class 8 science light notes smooth, polished and regular surfaces. Images are formed by regular reflection. The image formed in a plane mirror undergoes lateral inversion. Two mirrors inclined to each other give multiple images. Beautiful patterns are fon led in a kaleidoscope because of multiple reflections. Sunlight, called white light, consists of seven colours.
Splitting of light into its constituent colours is known as dispersion. The most comfortable distance at which one can read with a normal eye is 25 cm. Night blindness is the most common eye problem and it happens due Ncert Notes For Class 10th Social Science Ltd to vitamin A deficiency. Cornea: It is the transparent front part of the eye. Dispersion of Light Sunlight known as white light consists of seven different colours. Prism can split light into its constituent colours.
Iris is the coloured part of the eye. It controls the size of the pupil. Laws of Reflection The cbse class 8 science light notes laws of reflection are as follows: The incident ray, the normal and the reflected ray all lie on the same plane at the point of incidence.
The angle of reflection is always equal to the angle of incidence. The pupil is a small opening in the cornea. The retina is the site of the formation of an image. Rods: Rods are the nerve cells on retina, which are sensitive to dim light.
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