Properties of Light

A man of height $h$ is walking away from a street lamp with a constant speed $v$. The height of the street lamp is $3h$. The rate at which of the length of the man's shadow is increasing when he is at a distance $10h$ from the base of the street lamp is:

The frequency of oscillation of the electric field vector of a certain electromagnetic.wave is  $5\times {10}^{14}$ Hz. What is the frequency of oscillation of the corresponding magnetic field vector and to which part of the electromagnetic spectrum does it belong?

What is light?

What is the wavelength range of visible light ?

What is the first theorem of light?

The thickness of a glass plate is measured to be $2.17 \mathrm{mm},2.17 \mathrm{mm}$ and $2.18 \mathrm{mm}$ at three different places. Find the average thickness of the plate from this data. (in $\mathrm{mm}$)

(Answer approximately to three significant figures)

There are seven colours light available in the visible region of electromagnetic spectrum.

What is the importance of light?

What is the frequency range of electromagnetic wave that human eye can detect?

What is sign convention explain with diagram?

Define ray diagram.

_____ optics is also called Geometrical optics.

_____ is the branch of physics that is concerned with light, and its behavioural pattern and properties.

List the properties of electromagnetic waves:

_____ is non-luminous even though it shines at night.

The non-luminous objects are objects that generate their own light.

The speed of light in vacuum is $6\times {10}^{12} \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$.

The natural satellite of the Earth, the Moon is a luminous object. 

What are luminous objects? Give some examples of it also.