Activity - 6 (Demonstrated by teacher) Sun raysMaterial required : Convex lens, paper.Take a convex lens andhold it perpendicular to the sunrays. With your other handhold a paper on the other sideof the lens. Adjust the positionof the lens such that the raysfall as a shining dot on the pa-per. (fig. 9.11) If you hold thepaper and lens in the same po-sition for one or two minutes.You will find that the paperstarts burning. If you use car-bon paper it will burn in com-Fig 9.11paratively lesser time.The paper placed at the focus of the convex lens burns because the sunconverged to that point.

Activity - 6 (Demonstrated by teacher) Sun raysMaterial required : C

1.	Activity - 6 (Demonstrated by teacher) Sun raysMaterial required : Convex lens, paper.Take a convex lens andhold it perpendicular to the sunrays. With your other handhold a paper on the other sideof the lens. Adjust the positionof the lens such that the raysfall as a shining dot on the pa-per. (fig. 9.11) If you hold thepaper and lens in the same po-sition for one or two minutes.You will find that the paperstarts burning. If you use car-bon paper it will burn in com-Fig 9.11paratively lesser time.The paper placed at the focus of the convex lens burns because the sunconverged to that point.
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