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Two lenses of power +2.50D and -3.75D ar...

Two lenses of power `+2.50D` and `-3.75D `are combined to form a compound lens Its focal length in cm,will be

A

40

B

`-40`

C

`-80`

D

`160`

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-RAY OPTICS-Exercise-1
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  2. A concave lens of focal length 25 cm and a convex lens of focal length...

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

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

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

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

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

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

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

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

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

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

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

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  14. Shift on the principal axis

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  15. When the length of a microscope tube increases, its magnifying power

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  16. In a simple microscope, if the final image is located at infinity then...

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  17. In a simple microscope, if the final image is located at infinity then...

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  18. In astronomical telescope, the final image is formed at

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  19. Two convex lenses of focal lengths 0.3m and 0.05m are used to make a t...

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  20. An astronomical telescope has a magnifying power 10. The focal length ...

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