365130
Assertion : A red coloured object appears dark in the yellow light. Reason : The red colour is scattered less.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(\lambda_{\text {red }}>\lambda_{\text {yellow }}\) \(\left.\begin{array}{l}\text { Amount of } \\ \text { scattering }\end{array}\right\} \propto \dfrac{1}{\lambda^{4}}\) A red object appears red by reflecting red light and absorbing other colors. When illuminated with yellow light containing red and green, the object appears dark as it absorbs the yellow, reflecting less-scattered red light. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365131
Assertion : Blue colour of sky appears due to scattering of blue colour. Reason : Blue colour has very short wave length in visible spectrum.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
According to Rayleigh's criteria of scattering, the amount of scattering \(I\) is inversely proportional to the fourth power of the wavelength,\(\left(I \propto \dfrac{1}{\lambda^{4}}\right)\) \(\Rightarrow\) shorter wavelengths scatter more. Blue light has the shortest wavelength among visible colors, and as a result, it scatters readily when it encounters atmospheric particles like dust and water vapor. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365132
Assertion : Just before setting the sun may. appear to be oval (ellipse like).This happens due to refraction. Reason : Due to refraction of light, ray through the atmosphere causes different magnification.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Around Sun-set (evening), sun is at horizon. The refractive index of air decreases with height. Sun has distorted image due to bending in the denser atmosphere, creating compression or flattening effects and so 'oval' shape. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365133
Statement A : Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Statement B : Sun emits higher concentration of blue light waves in comparison with violet. This is why sky appears blue.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365130
Assertion : A red coloured object appears dark in the yellow light. Reason : The red colour is scattered less.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(\lambda_{\text {red }}>\lambda_{\text {yellow }}\) \(\left.\begin{array}{l}\text { Amount of } \\ \text { scattering }\end{array}\right\} \propto \dfrac{1}{\lambda^{4}}\) A red object appears red by reflecting red light and absorbing other colors. When illuminated with yellow light containing red and green, the object appears dark as it absorbs the yellow, reflecting less-scattered red light. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365131
Assertion : Blue colour of sky appears due to scattering of blue colour. Reason : Blue colour has very short wave length in visible spectrum.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
According to Rayleigh's criteria of scattering, the amount of scattering \(I\) is inversely proportional to the fourth power of the wavelength,\(\left(I \propto \dfrac{1}{\lambda^{4}}\right)\) \(\Rightarrow\) shorter wavelengths scatter more. Blue light has the shortest wavelength among visible colors, and as a result, it scatters readily when it encounters atmospheric particles like dust and water vapor. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365132
Assertion : Just before setting the sun may. appear to be oval (ellipse like).This happens due to refraction. Reason : Due to refraction of light, ray through the atmosphere causes different magnification.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Around Sun-set (evening), sun is at horizon. The refractive index of air decreases with height. Sun has distorted image due to bending in the denser atmosphere, creating compression or flattening effects and so 'oval' shape. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365133
Statement A : Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Statement B : Sun emits higher concentration of blue light waves in comparison with violet. This is why sky appears blue.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
365130
Assertion : A red coloured object appears dark in the yellow light. Reason : The red colour is scattered less.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(\lambda_{\text {red }}>\lambda_{\text {yellow }}\) \(\left.\begin{array}{l}\text { Amount of } \\ \text { scattering }\end{array}\right\} \propto \dfrac{1}{\lambda^{4}}\) A red object appears red by reflecting red light and absorbing other colors. When illuminated with yellow light containing red and green, the object appears dark as it absorbs the yellow, reflecting less-scattered red light. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365131
Assertion : Blue colour of sky appears due to scattering of blue colour. Reason : Blue colour has very short wave length in visible spectrum.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
According to Rayleigh's criteria of scattering, the amount of scattering \(I\) is inversely proportional to the fourth power of the wavelength,\(\left(I \propto \dfrac{1}{\lambda^{4}}\right)\) \(\Rightarrow\) shorter wavelengths scatter more. Blue light has the shortest wavelength among visible colors, and as a result, it scatters readily when it encounters atmospheric particles like dust and water vapor. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365132
Assertion : Just before setting the sun may. appear to be oval (ellipse like).This happens due to refraction. Reason : Due to refraction of light, ray through the atmosphere causes different magnification.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Around Sun-set (evening), sun is at horizon. The refractive index of air decreases with height. Sun has distorted image due to bending in the denser atmosphere, creating compression or flattening effects and so 'oval' shape. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365133
Statement A : Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Statement B : Sun emits higher concentration of blue light waves in comparison with violet. This is why sky appears blue.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
365130
Assertion : A red coloured object appears dark in the yellow light. Reason : The red colour is scattered less.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
\(\lambda_{\text {red }}>\lambda_{\text {yellow }}\) \(\left.\begin{array}{l}\text { Amount of } \\ \text { scattering }\end{array}\right\} \propto \dfrac{1}{\lambda^{4}}\) A red object appears red by reflecting red light and absorbing other colors. When illuminated with yellow light containing red and green, the object appears dark as it absorbs the yellow, reflecting less-scattered red light. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365131
Assertion : Blue colour of sky appears due to scattering of blue colour. Reason : Blue colour has very short wave length in visible spectrum.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
According to Rayleigh's criteria of scattering, the amount of scattering \(I\) is inversely proportional to the fourth power of the wavelength,\(\left(I \propto \dfrac{1}{\lambda^{4}}\right)\) \(\Rightarrow\) shorter wavelengths scatter more. Blue light has the shortest wavelength among visible colors, and as a result, it scatters readily when it encounters atmospheric particles like dust and water vapor. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365132
Assertion : Just before setting the sun may. appear to be oval (ellipse like).This happens due to refraction. Reason : Due to refraction of light, ray through the atmosphere causes different magnification.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
Around Sun-set (evening), sun is at horizon. The refractive index of air decreases with height. Sun has distorted image due to bending in the denser atmosphere, creating compression or flattening effects and so 'oval' shape. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365133
Statement A : Bluish colour predominates in a clear sky, since blue has a shorter wavelength and is scattered strongly. Statement B : Sun emits higher concentration of blue light waves in comparison with violet. This is why sky appears blue.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.