The image of a candle flame placed at a distance of 30cm from the mirror is obtained on a screen at 60cm. What type of mirror it is? Find it's focal length if the height of the object is 2.4 cm.
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u=-30cm
v=60cm
h=2.4cm
1/f=1/v-1/u
1/f=1/60-1/-30
1/f=1/60+1/30
1/f=2+1/60
1/f=3/60
1/f=1/20
f=20cm.
h'/h=v/u
h'/2.4=-2
h'=-4.8cm.
CONVEX LENS
F=20CM
H'=-4.8CM
v=60cm
h=2.4cm
1/f=1/v-1/u
1/f=1/60-1/-30
1/f=1/60+1/30
1/f=2+1/60
1/f=3/60
1/f=1/20
f=20cm.
h'/h=v/u
h'/2.4=-2
h'=-4.8cm.
CONVEX LENS
F=20CM
H'=-4.8CM
Akakakakakakakak:
can't we take v as negative
please tell fast
bhai ye mirror ka question h toh lens kaise ho gaya
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