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An iluminated object and a screen are pl...

An iluminated object and a screen are placed 90 cm apart.Determine the focal length and nature of the lens required to produce a clear image on the screen,twice the size of the object.

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MODERN PUBLICATION-REFRACTION OF LIGHT-EXERCISE
  1. An object is placed at a distance of 1.5 m from a screen and a convex...

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  2. Two lenses of powers +4 D and -14 D form a combination.If a 2 cm size ...

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  3. An iluminated object and a screen are placed 90 cm apart.Determine the...

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  4. A convex lens is used to obtain a magnified image of an object on a sc...

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  5. The image obtained iwth a convex lewns is ereect and its length is fou...

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  6. A lens of focal length 12 cm forms an upright image three times the si...

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  7. A lens of focal length 12 cm produces a virtual image,whose linear dim...

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  8. A lens has a power of +5 D in air.If completely immersed in water,what...

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  9. Find the ratio of the powers of a glass lens in water and in air .Give...

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  10. A glass convex lens has a power of +10 D.When ths lens is totally imme...

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  11. What is the focal length of a convex lens of focal length 30cm in cont...

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  12. A concave lens is placed in contact with a convvex lens of focal lengh...

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  13. Two thin lenses of focal lenths + 10 cm and - 5 cm are kept in contact...

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  14. Two thin lenses of focal lenths + 10 cm and - 5 cm are kept in contact...

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  15. Two lenses of focal length 10 cm and -20 cm are placed in contact .Wha...

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  16. A convex lens of focal lenth 30 cm and a concave lens of focal length ...

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  17. Two lenses of power 15.5 D and -5.5 D are placed in contact.What is te...

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  18. Two thin lenses of pwer +5D and -3D are in contact. What is the focal ...

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  19. A concave lens is kept in contact with a convex lens of focal length 2...

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  20. Two lenses of power +15 D and -5 D are in contact with each other form...

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