365009
A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from
1 two points propagating in two different non-parallel directions
2 two points propagating in two different parallel directions
3 one point propagating in two different directions
4 one point propagating in the same direction
Explanation:
In any medium other than air or vacuum, the velocities of different colours are different. Therefore, both red and green colours are refracted at different angles of refractions. Hence, after emerging from glass slab through opposite parallel face, they appear at two different points and move in two different parallel directions.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365010
Assertion : A ray of white light shows no dispersion on emerging from a glass slab although there occurs dispersion inside the glass slab. Reason : The velocity of light inside the glass slab is same for all different colours.
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:
When light enters a glass slab, it disperses into different colors because the velocity of light varies for each color. However, upon emerging from the parallel face of the slab, the rays of different colors reconverge in the same direction, to reconstitute white light. So correct option is (3).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365011
Due to atmosphere refraction,
1 The stars twinkle
2 The sun is seen before the actual sunrise and still seen after the sunset
3 The sun appears bigger during sunset or sunrise
4 All the above
Explanation:
Conceptual Question
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365012
A ray of light falls on a transparent glass slab of refractive index \({\sqrt{3}}\). If the reflected and refracted ray are at \({90^{\circ}}\) to each other, then the angle of incidence is
1 \({60^{\circ}}\)
2 \({30^{\circ}}\)
3 \({45^{\circ}}\)
4 \({90^{\circ}}\)
Explanation:
\(r+r^{\prime}=90^{\circ}\) So, \({m=\tan \theta}\) \(\sqrt{3}=\tan \theta\) \(\theta=60^{\circ}\)
365009
A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from
1 two points propagating in two different non-parallel directions
2 two points propagating in two different parallel directions
3 one point propagating in two different directions
4 one point propagating in the same direction
Explanation:
In any medium other than air or vacuum, the velocities of different colours are different. Therefore, both red and green colours are refracted at different angles of refractions. Hence, after emerging from glass slab through opposite parallel face, they appear at two different points and move in two different parallel directions.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365010
Assertion : A ray of white light shows no dispersion on emerging from a glass slab although there occurs dispersion inside the glass slab. Reason : The velocity of light inside the glass slab is same for all different colours.
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:
When light enters a glass slab, it disperses into different colors because the velocity of light varies for each color. However, upon emerging from the parallel face of the slab, the rays of different colors reconverge in the same direction, to reconstitute white light. So correct option is (3).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365011
Due to atmosphere refraction,
1 The stars twinkle
2 The sun is seen before the actual sunrise and still seen after the sunset
3 The sun appears bigger during sunset or sunrise
4 All the above
Explanation:
Conceptual Question
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365012
A ray of light falls on a transparent glass slab of refractive index \({\sqrt{3}}\). If the reflected and refracted ray are at \({90^{\circ}}\) to each other, then the angle of incidence is
1 \({60^{\circ}}\)
2 \({30^{\circ}}\)
3 \({45^{\circ}}\)
4 \({90^{\circ}}\)
Explanation:
\(r+r^{\prime}=90^{\circ}\) So, \({m=\tan \theta}\) \(\sqrt{3}=\tan \theta\) \(\theta=60^{\circ}\)
365009
A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from
1 two points propagating in two different non-parallel directions
2 two points propagating in two different parallel directions
3 one point propagating in two different directions
4 one point propagating in the same direction
Explanation:
In any medium other than air or vacuum, the velocities of different colours are different. Therefore, both red and green colours are refracted at different angles of refractions. Hence, after emerging from glass slab through opposite parallel face, they appear at two different points and move in two different parallel directions.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365010
Assertion : A ray of white light shows no dispersion on emerging from a glass slab although there occurs dispersion inside the glass slab. Reason : The velocity of light inside the glass slab is same for all different colours.
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:
When light enters a glass slab, it disperses into different colors because the velocity of light varies for each color. However, upon emerging from the parallel face of the slab, the rays of different colors reconverge in the same direction, to reconstitute white light. So correct option is (3).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365011
Due to atmosphere refraction,
1 The stars twinkle
2 The sun is seen before the actual sunrise and still seen after the sunset
3 The sun appears bigger during sunset or sunrise
4 All the above
Explanation:
Conceptual Question
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365012
A ray of light falls on a transparent glass slab of refractive index \({\sqrt{3}}\). If the reflected and refracted ray are at \({90^{\circ}}\) to each other, then the angle of incidence is
1 \({60^{\circ}}\)
2 \({30^{\circ}}\)
3 \({45^{\circ}}\)
4 \({90^{\circ}}\)
Explanation:
\(r+r^{\prime}=90^{\circ}\) So, \({m=\tan \theta}\) \(\sqrt{3}=\tan \theta\) \(\theta=60^{\circ}\)
365009
A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from
1 two points propagating in two different non-parallel directions
2 two points propagating in two different parallel directions
3 one point propagating in two different directions
4 one point propagating in the same direction
Explanation:
In any medium other than air or vacuum, the velocities of different colours are different. Therefore, both red and green colours are refracted at different angles of refractions. Hence, after emerging from glass slab through opposite parallel face, they appear at two different points and move in two different parallel directions.
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365010
Assertion : A ray of white light shows no dispersion on emerging from a glass slab although there occurs dispersion inside the glass slab. Reason : The velocity of light inside the glass slab is same for all different colours.
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:
When light enters a glass slab, it disperses into different colors because the velocity of light varies for each color. However, upon emerging from the parallel face of the slab, the rays of different colors reconverge in the same direction, to reconstitute white light. So correct option is (3).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365011
Due to atmosphere refraction,
1 The stars twinkle
2 The sun is seen before the actual sunrise and still seen after the sunset
3 The sun appears bigger during sunset or sunrise
4 All the above
Explanation:
Conceptual Question
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
365012
A ray of light falls on a transparent glass slab of refractive index \({\sqrt{3}}\). If the reflected and refracted ray are at \({90^{\circ}}\) to each other, then the angle of incidence is
1 \({60^{\circ}}\)
2 \({30^{\circ}}\)
3 \({45^{\circ}}\)
4 \({90^{\circ}}\)
Explanation:
\(r+r^{\prime}=90^{\circ}\) So, \({m=\tan \theta}\) \(\sqrt{3}=\tan \theta\) \(\theta=60^{\circ}\)
