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A concave lens of focal length 20 cm pro...

A concave lens of focal length 20 cm product an image half in size of the real object. The distance of the real object is

A

10 cm

B

`-20 cm`

C

`-60 cm`

D

`-40 cm`

Text Solution

Verified by Experts

The correct Answer is:
B
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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Additional Questions)
  1. To get three images of a single object, one should have two plane mirr...

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  2. If the radius of curvature of a convex mirror is 40 cm, then its focal...

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  3. The power of a lens of focal length 0.5 m is :

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  4. A concave lens of focal length 20 cm product an image half in size of ...

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  5. Two lenses of power +12 D and -2 D are combined together. What is thei...

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  6. What is the unit of refractive index?

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  7. Which process takes place in lens ?

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  8. Brilliance of diamond is due to

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  9. Mirage is formed due to .

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  10. The rainbow is formed due to

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  11. For what angle of incidence, the lateral shift produced by a parallel ...

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  12. Prism works on the principle of :

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  13. The final image produced by a simple microscope is :

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  14. Sky appears to be blue in clear atmosphere due to :

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  15. What is the unit of magnification of a microscope ?

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  16. Choose the correct alternative: A parallel beam of white light falls...

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  17. A concave lens always produces ……………………………. images.

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  18. A luminous object is separated from a screen by distance d. A convex l...

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  19. When light is incident on a medium of refractive index mu from rarer m...

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  20. If a very short pulse of white light were to travel through a glass pl...

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