OROne half of a cenvex lens of focal length 10 cm is covered with a bl

1.	OROne half of a cenvex lens of focal length 10 cm is covered with a black paper. Can suproduce an image of a complete object placed at a distance of 30 em from thelens.Dray:
Answer» 1.A convex lens can produce the complete image of the object even though half of the lens is covered .Because light rays coming from the object can be refracted from the other part of the lens. 2.Given:height of object= 4cm=h0focal length=f=20cm.u=-15cm after sign conventions.by lens formula,1/f=1/v-1/u1/v=1/f+1/u=1/20-1/15=3-4/60=-1/60v=-60cmsm=v/um=hi/ho=v/uhi=hoxv/u=4x(-60)/(-15)=8cmhi=8cm∴ Position of image is 60cm in front of lens size of image is 8cmnature of image is virtual and erect.

OROne half of a cenvex lens of focal length 10 cm is covered with a black paper. Can suproduce an image of a complete object placed at a distance of 30 em from thelens.Dray:

Answer»

1.A convex lens can produce the complete image of the object even though half of the lens is covered .Because light rays coming from the object can be refracted from the other part of the lens.

2.Given:height of object= 4cm=h0focal length=f=20cm.u=-15cm after sign conventions.by lens formula,1/f=1/v-1/u1/v=1/f+1/u=1/20-1/15=3-4/60=-1/60v=-60cmsm=v/um=hi/ho=v/uhi=hoxv/u=4x(-60)/(-15)=8cmhi=8cm∴ Position of image is 60cm in front of lens size of image is 8cmnature of image is virtual and erect.

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