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When a thin convex lens is put in contac...

When a thin convex lens is put in contact with a thin concave lens of the same focal length (f), then the resultant combination has focal length equal to

A

`f//2`

B

`2 f`

C

`0 `

D

`prop`

Text Solution

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The correct Answer is:
D
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MOTION-RAY OPTICS-Exercise-1
  1. A thin convex lens of focal length 10 cm and a thin concave lens of f...

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  2. A convex lens of focal length A and a concave lens of focal length B a...

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  3. When a thin convex lens is put in contact with a thin concave lens of ...

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  4. If I(1) and I(2) be the size of the images respectively for the two po...

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  5. A convex lens forms a real image on a screen placed at a distance 60 c...

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  6. A plano-convex lens when silvered on the plane side behaves like a con...

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  7. The plane surface of a plano-convex lens of focal length f is silvered...

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  8. A concave lens of focal length 25 cm and a convex lens of focal length...

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  9. Two lenses of power +2.50D and -3.75D are combined to form a compound ...

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  10. Lenses of powers 3D and -5D are combined to from a compound lens. An o...

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  11. An object placed at a distance of a 9cm from the first principal focus...

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  12. A convex lens of Focal length of 40cm is in contact with a concave len...

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  13. An object is put at a distance of 5cm from the first focus of a convex...

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  14. Focal length of convex lens is f. If this lens is cut along parallel t...

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  15. In the figure shown, there are two convex lenses L(1) and L(2) having ...

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  16. What should be the value of distance d so that final image is formed o...

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  17. If the central portion of a convex lens is wrapped in black paper as s...

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  18. Focal length of a convex lens will be maximum for

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  19. A convex lens form a real image of a point object placed on its princi...

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  20. Shift on the principal axis

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