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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

`mud`

B

`(d)/(mu)`

C

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

D

`(mud)/(mu-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
Shift`=t(1-(1)/(mu))=d`
`t=(d)/((1-(1)/(mu)))=(mud)/((mu-1))`
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CP SINGH-REFRACTION AT SPHERICAL SURFACES-EXERCISES
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  2. The position of fical image formed by the given lens combination from ...

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  3. An object is placed 12 cm to the left of a converging lens of focal le...

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  4. A converging lens forms a real image I on its optic axis. A rectangula...

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  5. A lens forms a sharp image on a screen. On inserting a parallel sided ...

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  6. A real image of an object is formed by a conex lens at the bottom of a...

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  7. A concave mirrorr of focal length f(1) is placed at a distance of d fr...

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  8. A concave lens of focal length 20 cm placed in contact with ah plane m...

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  9. The distance between a convex lens and a plane mirror is 10 cm. The pa...

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  10. A luminous object is placed at a distance of 30 cm from the convex len...

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  11. An object is placed at 15 cm from a convex lens of focal length 10 cm....

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  12. A convex lens of focal length 40cm is held at a distance 12cm coaxiall...

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  13. The focal length of a plano-convex lens is f and its refractive index ...

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  14. An equi-convex lens, having radius of curvature 33 cm is placed on a h...

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  15. A convex lens of focal length 15 cm is placed on a plane mirror. An ob...

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  16. A convex lens is placed in contact with a mirrorr as shown. If he spac...

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  17. A plano-convex lens when silvered on the plane side behaves line a con...

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  18. A plano-convex lens of focal length 30 cm has its plane surface silver...

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  19. A pin is placed 10cm in front of a convex lens of focal length 20cm, m...

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  20. A plano convex lens of refractive index 1.5 and radius of curvature 30...

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