The image of an ibject placed at a 30 cm from concave lens is formed at a distance of 10.Find out the focal length and power at lens
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Given that u= -30cm
And. v= -10cm
Lens formula =1/f=1/v-1/u
1/f = 1/-10- 1/-30
1/f= 1/-10+1/30
1/f= -3+1/30
1/f= -2/30
1/f= -1/15
Focal length = -15cm
Power = 1/f(in metre)
100/-15= -6.66D
And. v= -10cm
Lens formula =1/f=1/v-1/u
1/f = 1/-10- 1/-30
1/f= 1/-10+1/30
1/f= -3+1/30
1/f= -2/30
1/f= -1/15
Focal length = -15cm
Power = 1/f(in metre)
100/-15= -6.66D
roshansaw2002:
thankyou
for your answer
Your welcome........
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