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Chapter: 04. Light

⁠
The bouncing back of light into the same medium after striking a surface is known as _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Reflection of light
A _ _ _ _ _ _ _ _ _ _ _ _ _ _ object lets most of the light pass through it and reflects very little light.
Transparent
A translucent object, such as butter paper, lets some light pass through it and _ _ _ _ _ _ _ _ _ _ _ _ _ _ some of the light falling on its surface.
Reflects
An opaque object does not let any light pass through it, meaning it either absorbs or reflects most of the _ _ _ _ _ _ _ _ _ _ _ _ _ _ falling on it.
Light
A mirror is a smooth and highly _ _ _ _ _ _ _ _ _ _ _ _ _ _ surface which reflects most of the light falling on it.
Polished
The ray of light which strikes the reflecting surface is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Incident ray
The ray of light which is reflected back into the same medium after striking a surface is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Reflected ray
The point on the reflecting surface at which the incident ray strikes it is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Point of incidence
A perpendicular line drawn to the reflecting surface at the point of incidence is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Normal
The angle between the incident ray and the normal is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Angle of incidence
According to the second law of reflection, the angle of incidence and the angle of reflection are always _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Equal
The phenomenon in which the right side of an object appears to be at the left in its image, and vice versa, is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Lateral inversion
The distance of an object from a plane mirror is always _ _ _ _ _ _ _ _ _ _ _ _ _ _ to the distance of its image from the mirror.
Equal
When two plane mirrors are kept on opposite walls of a room, they make the room look _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Spacious
A _ _ _ _ _ _ _ _ _ _ _ _ _ _ is a long, vertical tube containing a set of mirrors used in submarines to observe objects above the surface of water.
Periscope
The speed of light in a vacuum or air is approximately _ _ _ _ _ _ _ _ _ _ _ _ _ _.
3 × 10⁸ m/s
The ratio by which the speed of light is slowed down in transparent materials is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the medium.
Refractive index
The speed of light in glass is _ _ _ _ _ _ _ _ _ _ _ _ _ _.
2 × 10⁸ m/s
Red, green, and blue are the three _ _ _ _ _ _ _ _ _ _ _ _ _ _ colours of light.
Primary
The colours produced by mixing any two primary colours are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ colours.
Secondary
Mixing red and green lights produces the secondary colour _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Yellow
A white object appears white because it reflects all the colours of white light and absorbs _ _ _ _ _ _ _ _ _ _ _ _ _ _ colour.
No
The seven colours of the rainbow can be remembered using the acronym _ _ _ _ _ _ _ _ _ _ _ _ _ _.
VIBGYOR
The process of determining the colour of an object when a light of a single colour or a mixture of colours is thrown on it is known as _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Colour subtraction
Regular reflection from a smooth and polished surface like a mirror is also known as _ _ _ _ _ _ _ _ _ _ _ _ _ _ reflection.
Specular
Sir David Brewster was a 19th-century British scientist who invented the _ _ _ _ _ _ _ _ _ _ _ _ _ _ in 1816.
Kaleidoscope
Gallery
 
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