NEET Test Series from KOTA - 10 Papers In MS WORD
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PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364962
Assertion : Optical fibre follows total internal reflection. Reason : In optical fibre, the diameter of the core is kept small.
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:
The smaller diameter of the core in optical fibers ensures that the fiber has an incident angle greater than the critical angle, facilitating total internal reflection, which is correctly explained in the reason. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364963
For the given incident ray as shown in figure, the condition of total internal refraction of this ray the minimum refractive index of prism will be :
364964
A ray of light strikes a plane water-air interface from within the water at an angle of incidence \(i\). Which one of the following statements is correct?
1 If \(i\) is \({90^ \circ },\) the angle of refraction will be the critical angle.
2 If \(i\) is equal to the critical angle, the reflected and refracted rays will be at right angles to each other .
3 If \(i\) is less than the critical angle, all the light is refracted and the angle of refraction is greater than \(i\).
4 If \(i\) is less than the critical angle, some light is refracted and the angle of reflection is less than the critical angle.
Explanation:
If \(i\) is less than the critical angle,then all the light is refracted and the angle of refraction is greater than \(i\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364965
A light wave travels from glass to water. The refractive index for glass and water are \(4/3\) and \(3/2\) respectively. The value of the critical angle will be:
1 \(\sin ^{-1}\left(\dfrac{1}{2}\right)\)
2 \(\sin ^{-1}\left(\dfrac{9}{8}\right)\)
3 \(\sin ^{-1}\left(\dfrac{8}{9}\right)\)
4 \(\sin ^{-1}\left(\dfrac{5}{7}\right)\)
Explanation:
Here water is denser and glass is rarer. \(\begin{aligned}& \dfrac{3}{2} \sin C=\dfrac{4}{3} \sin 90^{\circ} \\& \Rightarrow C=\sin ^{-1}\left(\dfrac{8}{9}\right) .\end{aligned}\)
364962
Assertion : Optical fibre follows total internal reflection. Reason : In optical fibre, the diameter of the core is kept small.
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:
The smaller diameter of the core in optical fibers ensures that the fiber has an incident angle greater than the critical angle, facilitating total internal reflection, which is correctly explained in the reason. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364963
For the given incident ray as shown in figure, the condition of total internal refraction of this ray the minimum refractive index of prism will be :
364964
A ray of light strikes a plane water-air interface from within the water at an angle of incidence \(i\). Which one of the following statements is correct?
1 If \(i\) is \({90^ \circ },\) the angle of refraction will be the critical angle.
2 If \(i\) is equal to the critical angle, the reflected and refracted rays will be at right angles to each other .
3 If \(i\) is less than the critical angle, all the light is refracted and the angle of refraction is greater than \(i\).
4 If \(i\) is less than the critical angle, some light is refracted and the angle of reflection is less than the critical angle.
Explanation:
If \(i\) is less than the critical angle,then all the light is refracted and the angle of refraction is greater than \(i\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364965
A light wave travels from glass to water. The refractive index for glass and water are \(4/3\) and \(3/2\) respectively. The value of the critical angle will be:
1 \(\sin ^{-1}\left(\dfrac{1}{2}\right)\)
2 \(\sin ^{-1}\left(\dfrac{9}{8}\right)\)
3 \(\sin ^{-1}\left(\dfrac{8}{9}\right)\)
4 \(\sin ^{-1}\left(\dfrac{5}{7}\right)\)
Explanation:
Here water is denser and glass is rarer. \(\begin{aligned}& \dfrac{3}{2} \sin C=\dfrac{4}{3} \sin 90^{\circ} \\& \Rightarrow C=\sin ^{-1}\left(\dfrac{8}{9}\right) .\end{aligned}\)
364962
Assertion : Optical fibre follows total internal reflection. Reason : In optical fibre, the diameter of the core is kept small.
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:
The smaller diameter of the core in optical fibers ensures that the fiber has an incident angle greater than the critical angle, facilitating total internal reflection, which is correctly explained in the reason. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364963
For the given incident ray as shown in figure, the condition of total internal refraction of this ray the minimum refractive index of prism will be :
364964
A ray of light strikes a plane water-air interface from within the water at an angle of incidence \(i\). Which one of the following statements is correct?
1 If \(i\) is \({90^ \circ },\) the angle of refraction will be the critical angle.
2 If \(i\) is equal to the critical angle, the reflected and refracted rays will be at right angles to each other .
3 If \(i\) is less than the critical angle, all the light is refracted and the angle of refraction is greater than \(i\).
4 If \(i\) is less than the critical angle, some light is refracted and the angle of reflection is less than the critical angle.
Explanation:
If \(i\) is less than the critical angle,then all the light is refracted and the angle of refraction is greater than \(i\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364965
A light wave travels from glass to water. The refractive index for glass and water are \(4/3\) and \(3/2\) respectively. The value of the critical angle will be:
1 \(\sin ^{-1}\left(\dfrac{1}{2}\right)\)
2 \(\sin ^{-1}\left(\dfrac{9}{8}\right)\)
3 \(\sin ^{-1}\left(\dfrac{8}{9}\right)\)
4 \(\sin ^{-1}\left(\dfrac{5}{7}\right)\)
Explanation:
Here water is denser and glass is rarer. \(\begin{aligned}& \dfrac{3}{2} \sin C=\dfrac{4}{3} \sin 90^{\circ} \\& \Rightarrow C=\sin ^{-1}\left(\dfrac{8}{9}\right) .\end{aligned}\)
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364962
Assertion : Optical fibre follows total internal reflection. Reason : In optical fibre, the diameter of the core is kept small.
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:
The smaller diameter of the core in optical fibers ensures that the fiber has an incident angle greater than the critical angle, facilitating total internal reflection, which is correctly explained in the reason. So correct option is (1).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364963
For the given incident ray as shown in figure, the condition of total internal refraction of this ray the minimum refractive index of prism will be :
364964
A ray of light strikes a plane water-air interface from within the water at an angle of incidence \(i\). Which one of the following statements is correct?
1 If \(i\) is \({90^ \circ },\) the angle of refraction will be the critical angle.
2 If \(i\) is equal to the critical angle, the reflected and refracted rays will be at right angles to each other .
3 If \(i\) is less than the critical angle, all the light is refracted and the angle of refraction is greater than \(i\).
4 If \(i\) is less than the critical angle, some light is refracted and the angle of reflection is less than the critical angle.
Explanation:
If \(i\) is less than the critical angle,then all the light is refracted and the angle of refraction is greater than \(i\).
PHXII09:RAY OPTICS AND OPTICAL INSTRUMENTS
364965
A light wave travels from glass to water. The refractive index for glass and water are \(4/3\) and \(3/2\) respectively. The value of the critical angle will be:
1 \(\sin ^{-1}\left(\dfrac{1}{2}\right)\)
2 \(\sin ^{-1}\left(\dfrac{9}{8}\right)\)
3 \(\sin ^{-1}\left(\dfrac{8}{9}\right)\)
4 \(\sin ^{-1}\left(\dfrac{5}{7}\right)\)
Explanation:
Here water is denser and glass is rarer. \(\begin{aligned}& \dfrac{3}{2} \sin C=\dfrac{4}{3} \sin 90^{\circ} \\& \Rightarrow C=\sin ^{-1}\left(\dfrac{8}{9}\right) .\end{aligned}\)
