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Q5. Which of the following phenomena of light are involved in the formation of a rainbow? A B Reflection, Refraction, Refraction & dispersion & internal dispersion reflection C D Dispersion, Reflection, scattering & total dispersion & internal reflection refraction
Q5. Which of the following phenomena of light are involved in the formation of a rainbow? A B Reflection, Refraction, Refraction & dispersion & internal dispersion reflection C D Dispersion, Reflection, scattering & total dispersion & internal reflection refraction
Q6. John spots a rainbow in the south eastern sky. Hence A B There are The sun is in the south east suspended raindrops in the air. C D The sun is in the Both A and C north west
Q6. John spots a rainbow in the south eastern sky. Hence A B There are The sun is in the south east suspended raindrops in the air. C D The sun is in the Both A and C north west
ATMOSPHERIC REFRACTION
Deviation of light as is passes through the atmosphere due to the variation in refractive index of air
Stars appear raised due to atmospheric refraction
Stars appear raised due to atmospheric refraction Height difference
Stars appear raised due to atmospheric refraction
Horizon line
Atmospheric refraction makes the sun appear higher than it is Horizon line
Difference in apparent and real position of sun is 2 minutes 2 Horizon minutes line
During sunset , we can see the sun 2 minutes after it crossed the horizon Apparent Real
Early sunrise and delayed sunset
TWINKLING OF STARS
Varying refractive index cause twinkling of stars
Since planets are considered as the collection of points, their twinkling effect averages out
Q7. The atmospheric refraction of light causes the twinkling of: A B Planets only. Stars only C D Planets and stars Stars and satellites
Q7. The atmospheric refraction of light causes the twinkling of: A B Planets only. Stars only C D Planets and stars Stars and satellites
Q8. Due to atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about A B 6 minutes 2 minutes C D 4 minutes 8 minutes
Q8. Due to atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about A B 6 minutes 2 minutes C D 4 minutes 8 minutes
SCATTERING OF LIGHT
The spreading of light is called Scattering of light.
Scattering of light was discovered by John Tyndall. It is called Tyndall Effect
Some colors scatter more, some less Violet Scattering Indigo Wavelength Blue Yellow Scattering Wavelength Orange Red
Scattering of light in the atmosphere gives: Orange colour to the sun during sunset and sunrise
Scattering of light in the atmosphere gives blue colour to the sky
Q9. Eye is more sensitive to yellow colour but why are danger signals painted red instead of yellow A The scattering B of red light is much The scattering of less than that of yellow light. red light is more than that of yellow light. C D Yellow light, when Red light, when scattered is brighter scattered is brighter
Q9. Eye is more sensitive to yellow colour but why are danger signals painted red instead of yellow A The scattering B of red light is much The scattering of less than that of yellow light. red light is more than that of yellow light. C D Yellow light, when Red light, when scattered is brighter scattered is brighter
Q10. The ________ colour is at the top and the ______colour is at the bottom of the spectrum
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