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A lens forms a sharp image on a screen. ...

A lens forms a sharp image on a screen. On inserting a parallel sided glass slab between the lens and the screen, it is found necessary to move the screen a distance `d` away the lens in order for the image to be sharp again. If the refractive index of the material of the slab is `mu`, the thickness of the slab is

A

`mu d`

B

`(d)/(mu)`

C

`(mu - 1) (d)/(mu)`

D

`(mu d)/(mu - 1)`

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • A sharp image of a distant object is obtained an a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the

    A
    lens and the object
    B
    lens and the screen
    C
    object and the screen
    D
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    • AAKASH INSTITUTE-RAY OPTICS AND OPTICAL INSTRUMENTS-Assignment (Section - B) Objective Type Questions (One option is correct)
    1. A lens forms a sharp image on a screen. On inserting a parallel sided ...

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    2. For an eye kept at a depth h inside water is refractive index mu, and ...

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    3. A convex lens A of focal length 20 cm and a concave lens B of focal le...

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    4. An equilateral triangular prism is made of glass (mu = 1.5). A ray of ...

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    5. White light is incident on the interface of glass and air as shown in ...

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    6. In a spherical paper weight (R = 10 cm) made of glass of refractive in...

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    7. A concave mirror is placed on a horizontal table, with its axis direct...

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    8. Two prisms of same glass (mu = sqrt(2)) are stuck together without gap...

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    9. Focal length of an equiconvex lens is 20 cm. The refractive index of m...

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

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    11. An object is placed 1m in front of the curved surface of a plano-conve...

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    12. Figure shows a torch sending a parallel beam of light fixed on a wall ...

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    13. A ray of light passes from vaccum into a medium of refractive index n....

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    14. A plane mirror is placed horizontally inside water (mu=4/3). A ray fal...

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    15. A thin lens focal length f(1) and its aperture has diameter d. It form...

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    16. A tank contains a transparent liquid of refractive index mu. The botto...

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