Question

Give reasons for the following
A) colour of the sky appears blue
B) stars appear twinkling
C) stars appear higher in sky
D) rainbow forms in the sky after rain
E) a pool of waterappears to be less deep than it actually is

Answer 1

Answer:

A) reason: scattering of light

Explanation: when the light rays of sun travel through atmosphere then small particles of atmosphere scatters the lights of smaller wavelength like blue colour light , so that the sky appears blue.

B)reason: atmospheric refraction

Explanation: when stars emit light it travel through different atmospheric layers with different densities continuously hence to cause refraction due to changes in speed of light rays led to the twinkling effect.

C)reason: atmospheric refraction

Explanation: when stars emit light it reaches us travelling through different refractive indexes of different atmospheric layers which led to the change in direction of light incident in our eyes by which we see the apparent star position.

D)reason: refraction; total internal reflection ; dispersion of light.

Explanation:light enter the water droplets causing refraction and the internal reflection take place with the dispersion of light to send spectrum out of the droplet led to rainbow formation.

E)reason:refraction

Explanation: speed of light changes when light enters from air to water of the pool causing refraction which led to the apparent deepness of the pool.

Answer 2

Explanation:

Stars twinkle because-

1) Of the turbulence's in our atmosphere like presence of wind, various gases molecule, different temperature region etc.

Advanced sunset and delayed sunrise-

1) Due to atmospheric refraction of the light emitted by the sun.

Blue color of sky-

1) As per fundamental colors of R(red) G(green) B(blue) , the color blue has the shortest wavelength thus scatters in all direction by the molecules present in the atmosphere thus making the color of sky blue.

Reddish colour of sky during sunrise and sunset-

1)The sunlight consists of seven colors (VIBGYOR) out of which only the color red does not scatters totally, because the intensity of the color red is higher than the rest of VIBGYOR color, hence making the only color visible to human eyes.

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