41.
Sunlight passes through a canopy of a dense forest is due to
A
Raman effect
B
Newton's ring
C
Spectral effect
D
Tyndall effect
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Sunlight passes through a canopy of a dense forest is due to
Raman effect
Newton's ring
Spectral effect
Tyndall effect
Select the colours in the correct ascending of wavelength:
blue, green, red
orange, green. Red
blue, yellow, green
orange, yellow, green
Refraction of light by the earth's atmosphere due to variation in air density is called
atmospheric reflection
atmospheric dispersion
atmospheric scattering
atmospheric refraction
Reason behind advance sunrise and delayed sunset
atmospheric refraction
total internal reflection
dispersion
reflection
Rainbows are created by sunlight
water particles
wind
dust particles
snow
One cannot see through the fog, because
refractive index of the fog is very high
light suffers total reflection at droplets
fog absorbs light
light is scattered by the droplets
Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.
Isaac Newton
Einstein
Kepler
Hans Christian Oersted
Mirages are common in
rainforests
dry forests
deserts
highlands
Mirage is formed because:
air above the ground is very hot and air above is cooler
both a and d are correct
light rays from a distant object bend towards the normal when coming towards the ground.
light rays from a distant object bend away from the normal when coming towards the ground.
Mirage is an example of
reflection of light and refraction of light
dispersion of light
total internal reflection
refraction of light and total internal reflection
In absence of atmosphere, the colour of sky appears
blue
black
red
yellow
If the angle of incidence of light while leaving the denser object is zero, the light would
be reflected back
go straight without any refraction
be refracted
end up at the boundary of the object
For which of the following cases will the total internal reflection of light be possible?
Angle of incidence is less than the critical angle.
Angle of incidence is equal to the critical angle.
Angle of incidence is greater than the critical angle.
Angle of incidence is equal to the angle of refraction.
Fibre optics work on the principle of
Scattering of light
Total internal reflection
Total internal absorption
Optical rotation
Due to atmospheric refraction, apparent length of the day
increases
decreases
remains the same
all of these
Clouds appears white due to
Water droplets scatters all wavelength
Water in frozen conditions looks icy white
Fog is formed around clouds
all of these
Blue colour of the sky is due to the phenomenon of:
Reflection of light
Refraction of light
Dispersion of light
Scattering of light
Atomspheric refraction occurs because
refractive index in medium is gradually changing
of presence of dust particles in atmosphere
large amount of moisture is present in atmosphere on a humid day
sun rays travel the most when sun is near the horizon
At the time of sunrise and sunset, the light from sun has to travel
longest distance of atmosphere
shortest distance of atmosphere
both a and b
cant say
At the time of sunrise and sunset
Blue colour scattered and red colour reaches our eye
Red colour scattered and blue colour reaches our eye
Green and blue scattered and orange reaches our eye
None of these