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

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SURA PUBLICATION-OPTICS-ADDITIONAL QUESTIONS & ANSWER (Fill in the blanks (Covers whole unit))
  1. When a ray of light strikes the lens obliquely at the optical centre,...

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

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

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

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

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

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

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  8. lenses are used in camera lenses.

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

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

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  11. Any optically will have a refractive index.

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  12. Convex lens mostly produces image.

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

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

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  15. protects the internal parts of the eye.

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  16. is the coloured portion of the eye.

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  17. A thin and transparent layer on the surface of eyeball is .

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  18. Central part of eye and pathway for the light to retina is .

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  19. Eye lens is fixed between the muscles.

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  20. Eye lens is in nature.

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