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In a lens , one of the faces of a bi-co...

In a __________ lens , one of the faces of a bi-concave lens is plane.

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SURA PUBLICATION-OPTICS-ADDITIONAL QUESTIONS & ANSWER (Fill in the blanks (Covers whole unit))
  1. When an object is placed between F and C, the size of the image is th...

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  2. If one of the focus of a bi-covnex lens is plane, it is known as a .

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  3. In a lens , one of the faces of a bi-concave lens is plane.

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  4. Concave lenses are used as eye lens of telescope.

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  5. When a ray of light strikes the lens obliquely at the optical centre,...

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  6. When a object is placed in between principal focus and optical centre ...

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  7. lenses are used is placed at infinity a is formed at the focus .

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  8. When an object is placed at infinity a is formed at the focus in conc...

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  9. The size of the image formed as the distance between the object and ...

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  10. lenses are used as wide angle spy hole in doors.

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  11. The ability of a lens to converge and diverge is called as its .

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  12. lenses are used in camera lenses.

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  13. The distance and perpendicular to the principal axis is taken as posi...

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  14. is defined as the ratio of the heigth of the image to the heigth of a ...

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  15. Any optically will have a refractive index.

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  16. Convex lens mostly produces image.

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  17. Power of a lens is numerically defined as the reciprocal of its .

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  18. and the lens maker's formula are applicable to only thin lenses.

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  19. protects the internal parts of the eye.

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  20. is the coloured portion of the eye.

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