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A transformer is used to reduce the main supply of 220V to 22V. If the currents in the primary and secondary are 2A and 15 A respectively, then the efficiency of the transformer is

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RESNICK AND HALLIDAY-GEOMETRICAL OPTICS : REFRACTION-Problems
  1. A double-convex lens is to be made of glass with an index of refractio...

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  2. A 20 mm thick layer of water (n=1.33) floats on a 40 mm thick layer of...

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  3. v22

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  4. A concave mirror of radius of curvature one meter is placed at the bot...

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  5. A slab of glass of refractive index 1.5 and thickness 3cm is placed wi...

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  6. A light ray, going through a prism with the angle of prism 60^@, is fo...

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  7. A movie camera with a (single) lens of focal length 75mm takes a pictu...

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  8. The index of refraction of benzene is 1.8 . What is the critical angle...

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  9. A point source of light is 80.0cm below the surface of a body of water...

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  10. Two spherical-shaped equal-sized glass fishbowls filled with water are...

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  11. When viewed normally through the flat surface the apparent thickness o...

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  12. One end of a glass rod 8cm in diameter has a hemishperical surface of ...

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  13. There are two spherical surfaces of radii R(1)=30cm and R(2)=60cm. In ...

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  14. What area of the ground below can be photographed at one time by a cam...

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  15. Two watch glasses of radii of curvature 10cm and 30cm are cemented at ...

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  16. An illuminated slide is held 68cm from a screen. How far from the slid...

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  17. A converging beam of light forms a sharp image on a screen. A lens is ...

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  18. A convex lens focuses an object 40cm from it on a screen placed 10cm a...

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  19. A plano-convex lens of focal length 40cm and refractive index =1.5 is ...

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  20. A beam of light diverges from P on the axis of a convex lens and the a...

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