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Transmission by optical fibres is an imp...

Transmission by optical fibres is an important method in communications. By total internal reflection, light is made to travel only along the core. However, the intensity falls-off exponentially with distance and is given by, `I = I_0 ^e-alphax`, where `alpha` is absorption coefficient. Then te correct graph for intensity vs distance is

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TARGET PUBLICATION-OPTICS-EXERCISE
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  2. Assertion: in optical fibre, the diameter of the core is kept small. ...

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  3. Transmission by optical fibres is an important method in communication...

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  4. Which of the following diagrams shows the correct use of prisms in the...

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  5. A point object O is placed in front of a glass rod having spherical en...

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  6. A virtual cannot be caought on a screen, Yet when we see a virtual ima...

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  7. If two power of a thick lense is P(1) and that of a thin lens is P(2)...

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  8. An equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY'...

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  9. The lens shown in the figure drawn below is made of two different mate...

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  10. An object is placed at a distance of (f)/(2) from a convex lens of foc...

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  11. In an optics experiment, with the position of the object fixed, a stud...

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  12. A student measures the focal length of a convex lens by keeping an obj...

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  13. Graph of position of image vs position of point object from a convex l...

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  14. The distance between an object and the screen is 75 cm. When a convex ...

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  15. Convex lens made up of glass (mu(g)=1.5) and radius of curvature R is ...

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  16. A double convex thin lens made of glass (refractive index mu=1.5) has ...

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  17. A convex lens of glass (mu=1.5) has a focal length of 8 cm when placed...

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  18. The power of a thin convex lens (""(a) mu(g)=1.5) is +5.0 D. When it i...

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  19. Figure given below shows a beam of light converging at point P. When a...

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  20. When two thin lenses are kept in contanct, the focal length of the com...

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