In solar cookers, a plain mirror is used to converge the sunlight.

To study a solar battery, a multi-range voltameter is used, which consists of a sensitive ideal micro-ammeter and a set of additional resistances. The voltmeter is connected across the battery. When 10 V range is selected on the voltameter, it show 1.4 V and when 100 V range is selected, The voltameter shows 2.8 V . If 1000 V range is selected, the voltmeter show 4.x, where x is a digit after the decimal point. Calculate value of x.

Answer the following questions : (1) On which principle does the solar cooker work? (2) State the two advantages of using the solar cooker. (3) State the two limitations of using the solar cooker.

Answer the following questions : (1) On which principle does the solar cooker work? (2) State the two advantages of using the solar cooker. (3) State the two limitations of using the solar cooker.

You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror

A solar water heater cannot be used to get hot water on ……………..

To study the structure and working of a solar cooker and/or water heater. Activity is done for understanding how the solar equipments are insulated and how does maximum heat absorption is ensured. Property : A black surface absorbs more heat. Structure : rarr It consists of an insulated metal box or a wooden box which is painted black from inside. rarr The box has a thick glass sheet as a cover over the box. rarr A plane or concave mirror is attached to the box that acts as a reflector. rarr Mirror focuses the rays of the sun into the box. State the advantages and limitations of using the solar cooker or solar water heater.

To study the structure and working of a solar cooker and/or water heater. Activity is done for understanding how the solar equipments are insulated and how does maximum heat absorption is ensured. Property : A black surface absorbs more heat. Structure : rarr It consists of an insulated metal box or a wooden box which is painted black from inside. rarr The box has a thick glass sheet as a cover over the box. rarr A plane or concave mirror is attached to the box that acts as a reflector. rarr Mirror focuses the rays of the sun into the box. What temperature is achieved in solar cooker/solar water heater ?

To study the structure and working of a solar cooker and/or water heater. Activity is done for understanding how the solar equipments are insulated and how does maximum heat absorption is ensured. Property : A black surface absorbs more heat. Structure : rarr It consists of an insulated metal box or a wooden box which is painted black from inside. rarr The box has a thick glass sheet as a cover over the box. rarr A plane or concave mirror is attached to the box that acts as a reflector. rarr Mirror focuses the rays of the sun into the box. State energy conversion in solar cooker/solar water heater.