Where should an object be placed from a converging lens of focal lengt

1.	Where should an object be placed from a converging lens of focal length 20cm, so as to obtain a real magnified image
Answer» ong>ANSWER: Copper is comparatively less reactive but reacts with REAGENTS like OXYGEN and water in atmosphere in a slow TIME. Also carbon dioxide helps in the reaction. As it is a metal, it will start corroding $.$ After some days, we will observe greenish layer on the surface of copper vessel due to the formation of copper carbonate. The required reaction is: Copper when reacts with carbon dioxide, water and oxygen FORMS basic copper carbonate. ${ \boxed{ \rm{2Cu + CO_2 + O_2 + H_2O \longrightarrow CuCO_3.Cu_(OH)_2}}}$ The basic carbonate is a green coloured substance formed due time. Another example is the statue of liberty in New York, USA.

Where should an object be placed from a converging lens of focal length 20cm, so as to obtain a real magnified image

Answer»

Copper is comparatively less reactive but reacts with REAGENTS like OXYGEN and water in atmosphere in a slow TIME. Also carbon dioxide helps in the reaction. As it is a metal, it will start corroding $.$

After some days, we will observe greenish layer on the surface of copper vessel due to the formation of copper carbonate. The required reaction is:

Copper when reacts with carbon dioxide, water and oxygen FORMS basic copper carbonate.

${ \boxed{ \rm{2Cu + CO_2 + O_2 + H_2O \longrightarrow CuCO_3.Cu_(OH)_2}}}$

The basic carbonate is a green coloured substance formed due time. Another example is the statue of liberty in New York, USA.

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