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An object is placed in fron of a concave...

An object is placed in fron of a concave mirror of focal length 20cm. The image formed is three times the size of the object. Calculate the two possible distances of the object from the mirror.

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UNITED BOOK HOUSE-MODEL PAPER SET-10-EXERCISE
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  2. Prove that the electric field intensity at a point is equal to the neg...

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  4. Write down the dimensional Formula of resistivity.

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  5. In a circuit with resistance R, current is supplied with n identical c...

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  6. State and write the mathematical form of Biot-Savart's law with concer...

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  7. Find an expression for force on current carrying conductor in a unifor...

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  8. State and prove Ampere’s circuital law.

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  9. State Faraday’s laws in electromagnetic induction.

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  10. A coil of area 0.15 m^2 and 100 turns is placed perpendicular to a mag...

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  11. Show that the current leads the voltage by an angle of pi/2 in a purel...

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  12. An object is placed in fron of a concave mirror of focal length 20cm. ...

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  13. A convex lens produces a real image double the size of the object, whe...

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  14. Show.that the de-Broglie wavelength lambda of electrons of energy E is...

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  15. What is mass defect of a nucleus?

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  16. What is binding energy?

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  17. Define nuclear fission with one fission reaction.

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  18. What is half life of radioactive element?

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  19. What is short sightedhess or myopia? What are the causes of this defec...

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  20. The magnetic induction at a point 4cm from a long current carrying Wir...

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