282316
The twinkling effect of star light is due to
1 total internal reflection
2 high dense matter of star
3 constant burning of hydrogen in the star
4 the fluctuating apparent position of the star being slightly different from the actual position of the star
Explanation:
D: The twinkling of star light is due to the fluctuating apparent position of star being slightly different from the actual position of the star.
JCECE-2009
Ray Optics
282317
An optical fiber can offer a band width of
1 \(250 \mathrm{MHz}\)
2 \(100 \mathrm{GHz}\)
3 \(750 \mathrm{MHz}\)
4 \(100 \mathrm{MHz}\)
Explanation:
B: An optical fibre can offer a bond width of \(100 \mathrm{GHz}\).
Optical fibre- It is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis through the process of total internal reflection.
GUJCET 2016
Ray Optics
282201
Light travels a distance \(x\) in time \(t_1\) in air and \(10 x\) in time \(t_2\) in another denser medium. What is the critical angle for this medium?
1 \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right)\)
2 \(\sin ^{-1}\left(\frac{t_2}{t_1}\right)\)
3 \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right)\)
4 \(\sin ^{-1}\left(\frac{t_1}{10 t_2}\right)\)
Explanation:
A: Let the speed of light through vacuum be c then,
\(c=\frac{x}{t_1}\)
and let the speed of light through the medium be \(\mathrm{v}\) then-
\(\mathrm{v}=\frac{10 \mathrm{x}}{\mathrm{t}_2}\)
So, absolute refractive index \((\mu)\) of the medium can be calculated by -
\(\begin{gathered}
\mu=\frac{c}{v} \\
\mu=\frac{\frac{x}{t_1}}{\frac{10 x}{t_2}} \\
\mu=\frac{t_2}{10 t_1}
\end{gathered}\)
Now, the critical angle is given by -
\(\begin{aligned}
\sin \theta_{\mathrm{c}}=\frac{1}{\mu} \\
\sin \theta_{\mathrm{c}}=\frac{1}{\frac{\mathrm{t}_2}{10 \mathrm{t}_1}} \\
\sin \theta_{\mathrm{c}}=\frac{10 \mathrm{t}_1}{\mathrm{t}_2} \\
\theta_{\mathrm{c}}=\sin ^{-1} \frac{10 \mathrm{t}_1}{\mathrm{t}_2}
\end{aligned}\)
NEET (UG) 07.05.2023
Ray Optics
282202
A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \(\frac{5}{3}\) is poured inside the bucket, then microscope have to be raised by \(30 \mathrm{~cm}\) to focus the object again. The height of the liquid in the bucket is:
282203
A vessel of depth 'd' is half filled with oil of refractive index \(n_1\) and the other half is filled with water of refractive index \(n_2\). The apparent depth of this vessel when viewed from above will be -
282316
The twinkling effect of star light is due to
1 total internal reflection
2 high dense matter of star
3 constant burning of hydrogen in the star
4 the fluctuating apparent position of the star being slightly different from the actual position of the star
Explanation:
D: The twinkling of star light is due to the fluctuating apparent position of star being slightly different from the actual position of the star.
JCECE-2009
Ray Optics
282317
An optical fiber can offer a band width of
1 \(250 \mathrm{MHz}\)
2 \(100 \mathrm{GHz}\)
3 \(750 \mathrm{MHz}\)
4 \(100 \mathrm{MHz}\)
Explanation:
B: An optical fibre can offer a bond width of \(100 \mathrm{GHz}\).
Optical fibre- It is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis through the process of total internal reflection.
GUJCET 2016
Ray Optics
282201
Light travels a distance \(x\) in time \(t_1\) in air and \(10 x\) in time \(t_2\) in another denser medium. What is the critical angle for this medium?
1 \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right)\)
2 \(\sin ^{-1}\left(\frac{t_2}{t_1}\right)\)
3 \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right)\)
4 \(\sin ^{-1}\left(\frac{t_1}{10 t_2}\right)\)
Explanation:
A: Let the speed of light through vacuum be c then,
\(c=\frac{x}{t_1}\)
and let the speed of light through the medium be \(\mathrm{v}\) then-
\(\mathrm{v}=\frac{10 \mathrm{x}}{\mathrm{t}_2}\)
So, absolute refractive index \((\mu)\) of the medium can be calculated by -
\(\begin{gathered}
\mu=\frac{c}{v} \\
\mu=\frac{\frac{x}{t_1}}{\frac{10 x}{t_2}} \\
\mu=\frac{t_2}{10 t_1}
\end{gathered}\)
Now, the critical angle is given by -
\(\begin{aligned}
\sin \theta_{\mathrm{c}}=\frac{1}{\mu} \\
\sin \theta_{\mathrm{c}}=\frac{1}{\frac{\mathrm{t}_2}{10 \mathrm{t}_1}} \\
\sin \theta_{\mathrm{c}}=\frac{10 \mathrm{t}_1}{\mathrm{t}_2} \\
\theta_{\mathrm{c}}=\sin ^{-1} \frac{10 \mathrm{t}_1}{\mathrm{t}_2}
\end{aligned}\)
NEET (UG) 07.05.2023
Ray Optics
282202
A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \(\frac{5}{3}\) is poured inside the bucket, then microscope have to be raised by \(30 \mathrm{~cm}\) to focus the object again. The height of the liquid in the bucket is:
282203
A vessel of depth 'd' is half filled with oil of refractive index \(n_1\) and the other half is filled with water of refractive index \(n_2\). The apparent depth of this vessel when viewed from above will be -
282316
The twinkling effect of star light is due to
1 total internal reflection
2 high dense matter of star
3 constant burning of hydrogen in the star
4 the fluctuating apparent position of the star being slightly different from the actual position of the star
Explanation:
D: The twinkling of star light is due to the fluctuating apparent position of star being slightly different from the actual position of the star.
JCECE-2009
Ray Optics
282317
An optical fiber can offer a band width of
1 \(250 \mathrm{MHz}\)
2 \(100 \mathrm{GHz}\)
3 \(750 \mathrm{MHz}\)
4 \(100 \mathrm{MHz}\)
Explanation:
B: An optical fibre can offer a bond width of \(100 \mathrm{GHz}\).
Optical fibre- It is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis through the process of total internal reflection.
GUJCET 2016
Ray Optics
282201
Light travels a distance \(x\) in time \(t_1\) in air and \(10 x\) in time \(t_2\) in another denser medium. What is the critical angle for this medium?
1 \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right)\)
2 \(\sin ^{-1}\left(\frac{t_2}{t_1}\right)\)
3 \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right)\)
4 \(\sin ^{-1}\left(\frac{t_1}{10 t_2}\right)\)
Explanation:
A: Let the speed of light through vacuum be c then,
\(c=\frac{x}{t_1}\)
and let the speed of light through the medium be \(\mathrm{v}\) then-
\(\mathrm{v}=\frac{10 \mathrm{x}}{\mathrm{t}_2}\)
So, absolute refractive index \((\mu)\) of the medium can be calculated by -
\(\begin{gathered}
\mu=\frac{c}{v} \\
\mu=\frac{\frac{x}{t_1}}{\frac{10 x}{t_2}} \\
\mu=\frac{t_2}{10 t_1}
\end{gathered}\)
Now, the critical angle is given by -
\(\begin{aligned}
\sin \theta_{\mathrm{c}}=\frac{1}{\mu} \\
\sin \theta_{\mathrm{c}}=\frac{1}{\frac{\mathrm{t}_2}{10 \mathrm{t}_1}} \\
\sin \theta_{\mathrm{c}}=\frac{10 \mathrm{t}_1}{\mathrm{t}_2} \\
\theta_{\mathrm{c}}=\sin ^{-1} \frac{10 \mathrm{t}_1}{\mathrm{t}_2}
\end{aligned}\)
NEET (UG) 07.05.2023
Ray Optics
282202
A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \(\frac{5}{3}\) is poured inside the bucket, then microscope have to be raised by \(30 \mathrm{~cm}\) to focus the object again. The height of the liquid in the bucket is:
282203
A vessel of depth 'd' is half filled with oil of refractive index \(n_1\) and the other half is filled with water of refractive index \(n_2\). The apparent depth of this vessel when viewed from above will be -
NEET Test Series from KOTA - 10 Papers In MS WORD
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Ray Optics
282316
The twinkling effect of star light is due to
1 total internal reflection
2 high dense matter of star
3 constant burning of hydrogen in the star
4 the fluctuating apparent position of the star being slightly different from the actual position of the star
Explanation:
D: The twinkling of star light is due to the fluctuating apparent position of star being slightly different from the actual position of the star.
JCECE-2009
Ray Optics
282317
An optical fiber can offer a band width of
1 \(250 \mathrm{MHz}\)
2 \(100 \mathrm{GHz}\)
3 \(750 \mathrm{MHz}\)
4 \(100 \mathrm{MHz}\)
Explanation:
B: An optical fibre can offer a bond width of \(100 \mathrm{GHz}\).
Optical fibre- It is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis through the process of total internal reflection.
GUJCET 2016
Ray Optics
282201
Light travels a distance \(x\) in time \(t_1\) in air and \(10 x\) in time \(t_2\) in another denser medium. What is the critical angle for this medium?
1 \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right)\)
2 \(\sin ^{-1}\left(\frac{t_2}{t_1}\right)\)
3 \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right)\)
4 \(\sin ^{-1}\left(\frac{t_1}{10 t_2}\right)\)
Explanation:
A: Let the speed of light through vacuum be c then,
\(c=\frac{x}{t_1}\)
and let the speed of light through the medium be \(\mathrm{v}\) then-
\(\mathrm{v}=\frac{10 \mathrm{x}}{\mathrm{t}_2}\)
So, absolute refractive index \((\mu)\) of the medium can be calculated by -
\(\begin{gathered}
\mu=\frac{c}{v} \\
\mu=\frac{\frac{x}{t_1}}{\frac{10 x}{t_2}} \\
\mu=\frac{t_2}{10 t_1}
\end{gathered}\)
Now, the critical angle is given by -
\(\begin{aligned}
\sin \theta_{\mathrm{c}}=\frac{1}{\mu} \\
\sin \theta_{\mathrm{c}}=\frac{1}{\frac{\mathrm{t}_2}{10 \mathrm{t}_1}} \\
\sin \theta_{\mathrm{c}}=\frac{10 \mathrm{t}_1}{\mathrm{t}_2} \\
\theta_{\mathrm{c}}=\sin ^{-1} \frac{10 \mathrm{t}_1}{\mathrm{t}_2}
\end{aligned}\)
NEET (UG) 07.05.2023
Ray Optics
282202
A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \(\frac{5}{3}\) is poured inside the bucket, then microscope have to be raised by \(30 \mathrm{~cm}\) to focus the object again. The height of the liquid in the bucket is:
282203
A vessel of depth 'd' is half filled with oil of refractive index \(n_1\) and the other half is filled with water of refractive index \(n_2\). The apparent depth of this vessel when viewed from above will be -
282316
The twinkling effect of star light is due to
1 total internal reflection
2 high dense matter of star
3 constant burning of hydrogen in the star
4 the fluctuating apparent position of the star being slightly different from the actual position of the star
Explanation:
D: The twinkling of star light is due to the fluctuating apparent position of star being slightly different from the actual position of the star.
JCECE-2009
Ray Optics
282317
An optical fiber can offer a band width of
1 \(250 \mathrm{MHz}\)
2 \(100 \mathrm{GHz}\)
3 \(750 \mathrm{MHz}\)
4 \(100 \mathrm{MHz}\)
Explanation:
B: An optical fibre can offer a bond width of \(100 \mathrm{GHz}\).
Optical fibre- It is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis through the process of total internal reflection.
GUJCET 2016
Ray Optics
282201
Light travels a distance \(x\) in time \(t_1\) in air and \(10 x\) in time \(t_2\) in another denser medium. What is the critical angle for this medium?
1 \(\sin ^{-1}\left(\frac{10 t_1}{t_2}\right)\)
2 \(\sin ^{-1}\left(\frac{t_2}{t_1}\right)\)
3 \(\sin ^{-1}\left(\frac{10 t_2}{t_1}\right)\)
4 \(\sin ^{-1}\left(\frac{t_1}{10 t_2}\right)\)
Explanation:
A: Let the speed of light through vacuum be c then,
\(c=\frac{x}{t_1}\)
and let the speed of light through the medium be \(\mathrm{v}\) then-
\(\mathrm{v}=\frac{10 \mathrm{x}}{\mathrm{t}_2}\)
So, absolute refractive index \((\mu)\) of the medium can be calculated by -
\(\begin{gathered}
\mu=\frac{c}{v} \\
\mu=\frac{\frac{x}{t_1}}{\frac{10 x}{t_2}} \\
\mu=\frac{t_2}{10 t_1}
\end{gathered}\)
Now, the critical angle is given by -
\(\begin{aligned}
\sin \theta_{\mathrm{c}}=\frac{1}{\mu} \\
\sin \theta_{\mathrm{c}}=\frac{1}{\frac{\mathrm{t}_2}{10 \mathrm{t}_1}} \\
\sin \theta_{\mathrm{c}}=\frac{10 \mathrm{t}_1}{\mathrm{t}_2} \\
\theta_{\mathrm{c}}=\sin ^{-1} \frac{10 \mathrm{t}_1}{\mathrm{t}_2}
\end{aligned}\)
NEET (UG) 07.05.2023
Ray Optics
282202
A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index \(\frac{5}{3}\) is poured inside the bucket, then microscope have to be raised by \(30 \mathrm{~cm}\) to focus the object again. The height of the liquid in the bucket is:
282203
A vessel of depth 'd' is half filled with oil of refractive index \(n_1\) and the other half is filled with water of refractive index \(n_2\). The apparent depth of this vessel when viewed from above will be -
