Wave Optics Test

Result

Wave Optics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

At the time of total solar eclipse, the spectrum of the solar radiation will have

A
a large number of dark lines

B
a small number of dark lines

C
no lines at all

D
all the Fraunhofer lines changed into brightly coloured lines

Solution

When the visible light from below the Sun's surface passes through the layers above it (the photosphere and the chromospheres), some of the light at particular wavelengths is absorbed by atoms and ions, so the missing lines are called Fraunhofer lines. At the time of the solar eclipse, there is no light from the central part (photosphere) of the sun on the earth. The light on the earth comes from chromospheres, which contains various elements of the excited gaseous state. The spectrum consists of bright emission lines against dark background. These bright lines correspond to the Fraunhofer lines observed in normal solar spectrum.
Question 2
1 / -0

In Young`s double slit experiment, if monochromatic source of light is replaced by white light, then one can see

A
no interference fringe pattern

B
coloured fringes

C
black and white fringes

D
white central fringe surrounded by few coloured fringes on either side

Solution

If white light is used, different colours will attain maxima at different points, except the central point because at the central point, all colours will have minima. Hence, the centre will be white.
Question 3
1 / -0

Diffraction pattern of a single slit consists of a central band, which is

A
wide and bright with alternate dark and bright bands of decreasing intensit

B
narrow and bright with alternate dark and bright bands of equal intensity

C
wide and bright with alternate dark and bright bands of equal intensity

D
dark with alternate dark and bright bands of decreasing intensity

Solution

It is found that the width of central maxima is twice as that of a secondary maxima. Also, the intensity of the secondary maxima goes on decreasing with the order of maxima.