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Define focal length of a lens...

Define focal length of a lens

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MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
  1. An object of 3 cm height is placed at a distance of 60 cm from a conve...

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

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  3. Define focal length of a lens

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

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  5. The image obtained with a convex lens is erect and its lenth is four t...

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  6. A pin of height 2 cm is placed on the principal axis of a converging l...

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  7. The image of the needle placed 10 cm from a lens is formed on a wall 2...

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  8. An object of size 3 cm is placed 14 cm in front of a concave lens of f...

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  9. Two thin converging lenses of focal lengths 0.15 m and 0.30 m are held...

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  10. Find the focal length and nature of a lens which should be placed in c...

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  11. The image of a candle flame placed at a distance of 30 cm form a spher...

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  12. Find the power of a convex lens which forms a real and inverted image ...

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  13. Define the principal focus of concave mirror.

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  14. The radius of curvature of a spherical mirror is 20cm.What is its foca...

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  15. Name a mirror which can give an erect and enlarged image of an object

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  16. Why do we perfer a convex mirror as back view mirror in vehicles?

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  17. Find the focal length of convex mirror whose radius of curvature is 32...

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  18. A concave mirror produces three times magnified real image of an objec...

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  19. A ray of light travelling in air enters obliquely into water. Does the...

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  20. Light enters from air to glass having refractive index 1.50 what is sp...

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