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 the wavelength range of visible light ?

_____ optics is also called Geometrical optics.

Which of the following is not a property of electromagnetic waves

Which of the following is correct?

The correct arrangement of colors in the descending order of their wavelength

The phenomenon which is studied in geometrical optics is called

A passenger in an aeroplane shall

In a single-slit diffraction experiment , the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band.

Which colour of the light has the longest wavelength?

The wavelength of Ultraviolet rays is between $300 \mathrm{pm}$ and _____.

The wavelength of Microwaves is between $0.3 \mathrm{mm}$ and _____.

The wavelength of visible light is between _____ $\mathrm{nm}$ and $800 \mathrm{nm}$.

Source of illumination for image formation in dark field microscope is:

A passenger in an aeroplane will

Choose the correct order of wavelength for below mentioned four regions of electromagnetic spectrum:

(Infrared rays, Radio waves, Microwaves, Ultraviolet rays)

The wavelength of red colour is $7 \times {10}^{-7} \mathrm{m}$ and that of blue is $4\times {10}^{-7} \mathrm{m}$. If $v_R$ and $v_B$ be the speed of red and blue colours respectively in glass. Then which of the following is correct?

The wavelength of red colour is $7 \times {10}^{-7} \mathrm{m}$ and that of blue is $4\times {10}^{-7} \mathrm{m}$. If $v_R$ and $v_B$ be the speed of red and blue colours respectively in vacuum. Then which of the following is correct?