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Derive an expression for the equivalent ...

Derive an expression for the equivalent focal length for two thin convex lenses in contact.

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UNITED BOOK HOUSE-MODEL PAPER SET-08-EXERCISE
  1. Will photoelectrons be emitted by copper plate of work function 4.4eV ...

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  2. Show that for an electron laccelerated by a potential difference of V-...

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  3. Show that kinetic energy of an electron in the first Bohr orbit is num...

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  4. Wahat is a p-n junction diode? Draw the circuit diagram of a full wav...

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  5. What is a photodiode? Draw theI-V characteristic curve of a photodiode...

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  6. Prove that current density of a metallic conductor is directly proport...

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  7. Define mobility of free electrons.

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  8. The potential difference between the terminals of a cell, in an open c...

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  9. State and explain Kirchhoff's laws for electrical circuits.

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  10. What is the principle of potentiomenter?

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  11. A potentiometer wire has a length 10m and a resistance of 4 ohm. A cel...

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  12. Define SI unit of magnetic flux.

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  13. Show that (dphi)/(dt) and V have the same dimension.

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  14. A conducting wire of length l is rotating with angular velocity w in a...

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  15. The electric mains in the house are marked ‘220v, 50Hz Write down the ...

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  16. How can an LCR circuit be made purely resistance?

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  17. A resistance of 400Omega and a capacitance of reactance 200Omega are c...

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  18. A resistance of 400Omega and a capacitance of reactance 200Omega are c...

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  19. Derive an expression for the equivalent focal length for two thin conv...

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  20. The distance between an object and a screen is 2m. Can an image of an ...

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