365125
The reason of seeing the sun a little before the sunrise is
1 Refraction of the light
2 Reflection of the light
3 Dispersion of the light
4 Scattering of the light
Explanation:
Option (1) is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365126
Sowmya and Leela were asked to draw the trajectory of a light ray near earth’s surface when refractive index is decreasing with increase in height. Figure shows the respective ray diagrams:
1 Sowmya is correct
2 Both are correct
3 Leela is correct
4 No conclusion can be drawn
Explanation:
As the ray is moving from denser to the rarer medium the light ray bends away from the normal. So leela is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365127
Assertion : The stars twinkle while the planets do not. Reason : The stars are much bigger in size than the planets.
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:
Stars twinkle due to atmospheric turbulence causing refractive effects on their distant light, while planets, being closer and having discernible disks, don't exhibit this twinkling. It is a different fact that Stars, despite their big size, seem small due to astronomical distances. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365128
The phenomena involved in the reflection of radiowaves by ionosphere similar to
1 Total internal reflection of light in air during a mirage
2 Reflection of light by a plane mirror
3 Scattering of light by the particles of air
4 Dispersion of light by water molecules during the formation of a rainbow
Explanation:
Conceptual Question
NCERT EXEMPLAR
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365129
A passenger in an aeroplane shall
1 See a primary and secondary rainbow as concentric circles
2 Never see a rainbow
3 Never see a secondary rainbow
4 See a primary and secondary rainbow as concentric arcs
Explanation:
A passenger in an aeroplane may see a primary and a secondary rainbow-like concentric circles.
365125
The reason of seeing the sun a little before the sunrise is
1 Refraction of the light
2 Reflection of the light
3 Dispersion of the light
4 Scattering of the light
Explanation:
Option (1) is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365126
Sowmya and Leela were asked to draw the trajectory of a light ray near earth’s surface when refractive index is decreasing with increase in height. Figure shows the respective ray diagrams:
1 Sowmya is correct
2 Both are correct
3 Leela is correct
4 No conclusion can be drawn
Explanation:
As the ray is moving from denser to the rarer medium the light ray bends away from the normal. So leela is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365127
Assertion : The stars twinkle while the planets do not. Reason : The stars are much bigger in size than the planets.
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:
Stars twinkle due to atmospheric turbulence causing refractive effects on their distant light, while planets, being closer and having discernible disks, don't exhibit this twinkling. It is a different fact that Stars, despite their big size, seem small due to astronomical distances. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365128
The phenomena involved in the reflection of radiowaves by ionosphere similar to
1 Total internal reflection of light in air during a mirage
2 Reflection of light by a plane mirror
3 Scattering of light by the particles of air
4 Dispersion of light by water molecules during the formation of a rainbow
Explanation:
Conceptual Question
NCERT EXEMPLAR
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365129
A passenger in an aeroplane shall
1 See a primary and secondary rainbow as concentric circles
2 Never see a rainbow
3 Never see a secondary rainbow
4 See a primary and secondary rainbow as concentric arcs
Explanation:
A passenger in an aeroplane may see a primary and a secondary rainbow-like concentric circles.
365125
The reason of seeing the sun a little before the sunrise is
1 Refraction of the light
2 Reflection of the light
3 Dispersion of the light
4 Scattering of the light
Explanation:
Option (1) is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365126
Sowmya and Leela were asked to draw the trajectory of a light ray near earth’s surface when refractive index is decreasing with increase in height. Figure shows the respective ray diagrams:
1 Sowmya is correct
2 Both are correct
3 Leela is correct
4 No conclusion can be drawn
Explanation:
As the ray is moving from denser to the rarer medium the light ray bends away from the normal. So leela is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365127
Assertion : The stars twinkle while the planets do not. Reason : The stars are much bigger in size than the planets.
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:
Stars twinkle due to atmospheric turbulence causing refractive effects on their distant light, while planets, being closer and having discernible disks, don't exhibit this twinkling. It is a different fact that Stars, despite their big size, seem small due to astronomical distances. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365128
The phenomena involved in the reflection of radiowaves by ionosphere similar to
1 Total internal reflection of light in air during a mirage
2 Reflection of light by a plane mirror
3 Scattering of light by the particles of air
4 Dispersion of light by water molecules during the formation of a rainbow
Explanation:
Conceptual Question
NCERT EXEMPLAR
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365129
A passenger in an aeroplane shall
1 See a primary and secondary rainbow as concentric circles
2 Never see a rainbow
3 Never see a secondary rainbow
4 See a primary and secondary rainbow as concentric arcs
Explanation:
A passenger in an aeroplane may see a primary and a secondary rainbow-like concentric circles.
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365125
The reason of seeing the sun a little before the sunrise is
1 Refraction of the light
2 Reflection of the light
3 Dispersion of the light
4 Scattering of the light
Explanation:
Option (1) is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365126
Sowmya and Leela were asked to draw the trajectory of a light ray near earth’s surface when refractive index is decreasing with increase in height. Figure shows the respective ray diagrams:
1 Sowmya is correct
2 Both are correct
3 Leela is correct
4 No conclusion can be drawn
Explanation:
As the ray is moving from denser to the rarer medium the light ray bends away from the normal. So leela is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365127
Assertion : The stars twinkle while the planets do not. Reason : The stars are much bigger in size than the planets.
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:
Stars twinkle due to atmospheric turbulence causing refractive effects on their distant light, while planets, being closer and having discernible disks, don't exhibit this twinkling. It is a different fact that Stars, despite their big size, seem small due to astronomical distances. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365128
The phenomena involved in the reflection of radiowaves by ionosphere similar to
1 Total internal reflection of light in air during a mirage
2 Reflection of light by a plane mirror
3 Scattering of light by the particles of air
4 Dispersion of light by water molecules during the formation of a rainbow
Explanation:
Conceptual Question
NCERT EXEMPLAR
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365129
A passenger in an aeroplane shall
1 See a primary and secondary rainbow as concentric circles
2 Never see a rainbow
3 Never see a secondary rainbow
4 See a primary and secondary rainbow as concentric arcs
Explanation:
A passenger in an aeroplane may see a primary and a secondary rainbow-like concentric circles.
365125
The reason of seeing the sun a little before the sunrise is
1 Refraction of the light
2 Reflection of the light
3 Dispersion of the light
4 Scattering of the light
Explanation:
Option (1) is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365126
Sowmya and Leela were asked to draw the trajectory of a light ray near earth’s surface when refractive index is decreasing with increase in height. Figure shows the respective ray diagrams:
1 Sowmya is correct
2 Both are correct
3 Leela is correct
4 No conclusion can be drawn
Explanation:
As the ray is moving from denser to the rarer medium the light ray bends away from the normal. So leela is correct.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365127
Assertion : The stars twinkle while the planets do not. Reason : The stars are much bigger in size than the planets.
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:
Stars twinkle due to atmospheric turbulence causing refractive effects on their distant light, while planets, being closer and having discernible disks, don't exhibit this twinkling. It is a different fact that Stars, despite their big size, seem small due to astronomical distances. So correct option is (2).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365128
The phenomena involved in the reflection of radiowaves by ionosphere similar to
1 Total internal reflection of light in air during a mirage
2 Reflection of light by a plane mirror
3 Scattering of light by the particles of air
4 Dispersion of light by water molecules during the formation of a rainbow
Explanation:
Conceptual Question
NCERT EXEMPLAR
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365129
A passenger in an aeroplane shall
1 See a primary and secondary rainbow as concentric circles
2 Never see a rainbow
3 Never see a secondary rainbow
4 See a primary and secondary rainbow as concentric arcs
Explanation:
A passenger in an aeroplane may see a primary and a secondary rainbow-like concentric circles.
