364525 The attenuation in optical fibre is mainly due to

364526 Statement A :
It is possible that mass density of an optically denser medium may be less than that of an optically rarer medium.
Statement B :
Optical density depends on ratio of the speed of light in two media.

364527 In a reflecting telescope, a secondary mirror is used to

364528 Assertion :
Owls can move freely during night.
Reason :
They have large number of rods on their retina.

364529 A convex lens of focal length \(40\;\,cm\) forms an image of an extended source of light on a photoelectric cell. A current \(I\) is produced. The lens is replaced by another convex lens having the same diameter but focal length \(20\;\,cm\). The photoelectric current now is :

364525 The attenuation in optical fibre is mainly due to

364526 Statement A :
It is possible that mass density of an optically denser medium may be less than that of an optically rarer medium.
Statement B :
Optical density depends on ratio of the speed of light in two media.

364527 In a reflecting telescope, a secondary mirror is used to

364528 Assertion :
Owls can move freely during night.
Reason :
They have large number of rods on their retina.

364529 A convex lens of focal length \(40\;\,cm\) forms an image of an extended source of light on a photoelectric cell. A current \(I\) is produced. The lens is replaced by another convex lens having the same diameter but focal length \(20\;\,cm\). The photoelectric current now is :

364525 The attenuation in optical fibre is mainly due to

364526 Statement A :
It is possible that mass density of an optically denser medium may be less than that of an optically rarer medium.
Statement B :
Optical density depends on ratio of the speed of light in two media.

364527 In a reflecting telescope, a secondary mirror is used to

364528 Assertion :
Owls can move freely during night.
Reason :
They have large number of rods on their retina.

364529 A convex lens of focal length \(40\;\,cm\) forms an image of an extended source of light on a photoelectric cell. A current \(I\) is produced. The lens is replaced by another convex lens having the same diameter but focal length \(20\;\,cm\). The photoelectric current now is :

364525 The attenuation in optical fibre is mainly due to

364526 Statement A :
It is possible that mass density of an optically denser medium may be less than that of an optically rarer medium.
Statement B :
Optical density depends on ratio of the speed of light in two media.

364527 In a reflecting telescope, a secondary mirror is used to

364528 Assertion :
Owls can move freely during night.
Reason :
They have large number of rods on their retina.

364529 A convex lens of focal length \(40\;\,cm\) forms an image of an extended source of light on a photoelectric cell. A current \(I\) is produced. The lens is replaced by another convex lens having the same diameter but focal length \(20\;\,cm\). The photoelectric current now is :

364525 The attenuation in optical fibre is mainly due to

364526 Statement A :
It is possible that mass density of an optically denser medium may be less than that of an optically rarer medium.
Statement B :
Optical density depends on ratio of the speed of light in two media.

364527 In a reflecting telescope, a secondary mirror is used to

364528 Assertion :
Owls can move freely during night.
Reason :
They have large number of rods on their retina.

364529 A convex lens of focal length \(40\;\,cm\) forms an image of an extended source of light on a photoelectric cell. A current \(I\) is produced. The lens is replaced by another convex lens having the same diameter but focal length \(20\;\,cm\). The photoelectric current now is :