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With a concave mirror,the magnification ...

With a concave mirror,the magnification is found to be four times as large,when the object was 25 cm fom the mirror as it was with the object at 40 cm from the mirror,the image being real in both the cases.Find the focal length of teh concave miror.

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MODERN PUBLICATION-REFLECTION OF LIGHT-EXERCISE
  1. An object of 3 cm length is placed at 10 cm from the ple of a concave ...

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  2. An object placed 12 cm from the pole of a concave mirror produces a re...

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  3. An erect image of 3 tiems the size of the object is obtined with a con...

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  4. An object 8 cm long is placed at a distance of 100 cm from a concave m...

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  5. An object 2 cm high is placed at a distance of 5 cm from a concave mir...

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  6. An object is placed in front of a concave mirror of radius of curvatur...

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  7. A concave mirror produeces a real image of magnificaion 1//2,when an o...

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  8. Find the position of an object,which when placed in front of a concave...

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  9. An object is kept in front of a concave mirror of focal length 15 cm.T...

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  10. An object is kept in front of a concave mirror of focal length 15 cm.T...

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  11. An object 5.0 cm of length is placed at a distance of 20 cm in front o...

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  12. An object of 3 cm height is placed at a distance of 60 cm from a conve...

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  13. When an object is placed at a distance of 60 cm from a convex spherica...

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  14. A spherical convex mirror of focal length 25 cm has an object of lengt...

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  15. An object is placed in front of a convex mirror of focal length 30 cm....

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  16. An object is placed exactly midway between a convex and concave mirror...

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  17. A candle is flame 1 cm high is placed at a distance of 1.5 metre from ...

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  18. If a concave mirror of focal length f produces a real image n times th...

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  19. With a concave mirror,the magnification is found to be four times as l...

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  20. A short linear object of length b lies along the axis of a concave mir...

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