Question

1. What is the nature of light?
2. Give the wavelength range of light waves.
3. Define a ray of light.
4. State two laws of reflection of light.​

Answer 1

Answer:

• Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference. Like all electromagnetic waves, light can travel through a vacuum.
• Type of Radiation Frequency Range (Hz) Wavelength Range
• ultraviolet 1015 - 1017 400 nm - 1 nm
• visible 4 - 7.5*1014 750 nm - 400 nm
• near-infrared 1*1014 - 4*1014 2.5 μm - 750 nm
• infrared 1013 - 1014 25 μm - 2.5 μm
• Definition. A light ray is a line (straight or curved) that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector. Light rays in homogeneous media are straight. They bend at the interface between two dissimilar media and may be curved in a medium in which the refractive index changes ...
• laws of reflection are as follows: The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence lie in the same plane. The angle which the incident ray makes with the normal is equal to the angle which the reflected ray makes to the same normal.

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Answer 2

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1) Light is a transverse, electromagnetic wave that can be seen by the typical human. The wave nature of light was first illustrated through experiments on diffraction and interference. Like all electromagnetic waves, light can travel through a vacuum

3) A light ray is a line (straight or curved) that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector. Light rays in homogeneous media are straight. They bend at the interface between two dissimilar media and may be curved in a medium in which the refractive index changes .

4) The laws of reflection are as follows: The incident ray, the reflected ray and the normal to the reflection surface at the point of the incidence lie in the same plane. The angle which the incident ray makes with the normal is equal to the angle which the reflected ray makes to the same normal.