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When rays parallel to the principal axis...

When rays parallel to the principal axis strikes a concex lens, the refracted rays are __________ .

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For a Convex lens, if the incident ray is parallel to the principle axis, then the refracted ray passes through the……………….

The point at which the principal axis meets the surface of the lens is ________.

A thin lens made of a material of refractive index mu_2 has a medium of refractive index mu_1 on one side and a medium of refractive index on the other side. The lens is biconvex and the two radii of curvature have equal magnitude R. A beam of light travelling parallel to the principal axis is incident on the lens. Where will the image be formed if the beam is incident from (a) the medium p, and (b) from the medium mu_3 ?

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SURA PUBLICATION-OPTICS-ADDITIONAL QUESTIONS & ANSWER (Fill in the blanks (Covers whole unit))
  1. The lines having frequencies higher than the incident frequency is cal...

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  2. is an optically transparent medium bounded by two spherical refracting...

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  3. When rays parallel to the principal axis strikes a concex lens, the re...

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  4. When an object is placed beyond C, a real and inverted images is forme...

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  5. lenses are used in making microscope and telescope.

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  6. When an object is placed between F and C, the size of the image is th...

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

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

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

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

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

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

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

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

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

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

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  17. lenses are used in camera lenses.

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

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

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  20. Any optically will have a refractive index.

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