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What is the length of the image of the r...

What is the length of the image of the rod in mirror, according to the observer in air? (refractive index of the liquid is `mu`)

A

`muL + L`

B

`L + (L)/(mu)`

C

`Lmu + (L)/(mu)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B

When observer in rarer medium and objects is in denser medium then the length of immersed portion will be shorter (apparent) Hence length of image of rod in water =`2L +muL - L = L+muL`
Hence length of image of rod seen by observer in air is = `(L + muL)/(mu) = (L)/(mu) +L` . Hence [B]
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ALLEN-GEOMETRICAL OPTICS-EXERCISE-2
  1. An infinitely long rod lies along the axis of a concave mirror of foca...

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  2. A short linear object of length b lies along the axis of a concave mir...

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  3. What is the length of the image of the rod in mirror, according to the...

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  4. Two thin slabs of refractive indices mu(1) and mu(2) are placed parall...

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  5. A point source S is placed at the bottom of different layers as shown ...

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  6. A ray of light of refractive index 1.4approaches the boundary surface ...

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  7. A ray of light strikes a cubical slab surrounded by air as shown in th...

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  8. A cubical block of glass of refractive index n1 is in contact with the...

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  9. A beam of diameter 'd' is incident on a glass hemisphere as shown. If ...

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  10. When the object is at distance u(1)andu(2)the images formed by the sa...

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  11. A light ray hits the pole of a thin biconvex lens as shown in fig. The...

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  12. A ray of light passes through a prism in a principle plane the deviati...

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  13. The diagram shows five isosceles right angled prisms.A light ray incid...

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  14. A certain prism is found to produce a minimum of38^(@).It produces a d...

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  15. A ray incident at an angle 53^(@) on a prism emerges at an angle 37^(@...

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  16. A man of height 170cmwants to see his complete image in a plane mirror...

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  17. Two plane mirrors at an angle such that a ray incident on a mirror und...

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  18. If the equation of mirror is given by y= 2//pi "sin"pix (y gt 0 , 0 le...

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  19. In the fig. shown consider the first reflection at the plane mirror an...

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  20. The figure shows a ray incident a angle i=pi//3 of the plot drawn show...

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