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The focal length of concave lens, accro...

The focal length of concave lens, accroding to new Cartesiaon sign conventions is

A

negative.

B

positive.

C

can be negative only for object kept between opotical centre and focus.

D

can be positive only for object kept between optical centre and focus.

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TARGET PUBLICATION-OPTICS-EXERCISE
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  2. A plano-convex lens has focal length of 20 cm. the radius of its sph...

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  3. The focal length of concave lens, accroding to new Cartesiaon sign co...

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  4. A diverging lens may NOT have

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  5. A concave lens of focal length f produces an image (1)/(4) of the size...

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  6. A concave lens has radioi of curvatures of 20 cm and 30 cm respective...

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  7. The radius of curvature of each surface of a biconcave lens made up of...

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  8. A single lens, which will form the image of a given object at the same...

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  9. Two thin lenses may be combined so as to

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  10. Two thin lenses with focal lenghts f(1) and f(2) make a lens of focal ...

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  11. Two thin converging lenses of focal length 15 cm and 30 cm are held i...

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  12. What is the focal of the combination of a convex lens of focal length...

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  13. Two thin lenses, aone convex of focal length 10 cm and other concave l...

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  14. Two lenses of power +12and-2 dioptres are placed in contact. What will...

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  15. When two or more lnses of magnification m(1) ,m(2), m(3) are kept in c...

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  16. The separation of whtie light into its constituent colours after passi...

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  17. A shaped triangular transparent block havin three rectangular planes ...

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  18. The angle between the two-plane rectangular refracing surface of a pri...

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  19. The rectangular face opposite to the refracting edge is called .

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  20. The refractivity of the material of the prism is given by

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