A convex lens of power 4D is placed at a distance of 40 cm from a wall.At what distance from the lens should a candle be placed so that its image is formed on the wall?
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power=1/focal length
4D=1/f
f=1/4m
v=40cm=0.4m
1/f=1/v-1/u
1/1/4=1/0.4-1/u
-1/u=4-10/4
-1/u=3/2
u=- 2/3= -0.67m
candel should be placed -0.67m away from lens
4D=1/f
f=1/4m
v=40cm=0.4m
1/f=1/v-1/u
1/1/4=1/0.4-1/u
-1/u=4-10/4
-1/u=3/2
u=- 2/3= -0.67m
candel should be placed -0.67m away from lens
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3
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