Light travels faster in…….
a) air
b) water
c) glass
d) vacuum
Dispersion:
When white light is passed through a glass prism it
splits into its spectrum of colours (in order violet, indigo, blue, green,
yellow, orange and red) and this process of white light splitting into its
constituent colours is termed as dispersion.
The simplest way to explain dispersion is through dispersion in the prism.
When sunlight
(white light) falls on a triangular prism, a band of colours called a ……..is obtained.
a) beam
b) spectrum
c) arrow
d) line
When sunlight (white light) falls on a triangular prism, a band of colours called a spectrum is obtained. This effect is known as
a) transmission of light
b) absorption of light
c) dispersion of light
d) none of these
White light is a mixture of ……..colours.
a) 3
b) 7
c) 9
d) 13
Explanation:The sunlight splits into seven colors namely violet, indigo, blue, green, yellow, orange, and red. We usually call it as VIBGYOR.
Ray Model Of Light:
A ray is as a narrow beam of light that tends to travel in a straight line. An example of a ray is the beam of light from a laser or laser pointer. In the ray model of light, a ray travels in a straight line until it hits something, like a mirror, or an interface between two different materials. The interaction between the light ray and the mirror or interface generally causes the ray to change direction, at which point the ray again travels in a straight line until it encounters something else that causes a change in direction.
