The image of needle placed 10cm away from the lens on wall 20cm on the other side of lens. Find the focal length and size of image formed, if the size of object is 2.5cm.
chirag8874695183:
reply yr. h2 is 5cm or not??
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Answered by
197
given v =20cm
u=10cm
h1=2.5cm
now by using lens formula
1/v-1/u=1/f
1/20+1/10=1/f
1/f=3/20
f=20/3=6.67cm.
focal length =6.67cm
now.....
v/u=h2/h1
20/10=h2/2.5
h2=2.5*20/10
h2=5cm.
so size of image is 5cm.
if my answer is helpful for you then please mark as brain liest
u=10cm
h1=2.5cm
now by using lens formula
1/v-1/u=1/f
1/20+1/10=1/f
1/f=3/20
f=20/3=6.67cm.
focal length =6.67cm
now.....
v/u=h2/h1
20/10=h2/2.5
h2=2.5*20/10
h2=5cm.
so size of image is 5cm.
if my answer is helpful for you then please mark as brain liest
is image height is right???
ya right
thanks
u r most welcome
Answered by
129
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