for a convex lens of focal length 50cm, what is the position of image if the object is placed at a distance of
1-30cm
2-80cm
from the optical centre
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Explanation:
1)
1/f = 1/v - 1/u
1/50 = 1/v -(- 1/30)
1/50 -1/30 = 1/v
3-5/150 =1/v
v = -75 cm
it means it is virtual and formed inside the lens and it is enlarged.
2)
1/f = 1/v-1/u
1/50 = 1/v- (-1/80)
1/50 - 1/80 = 1/v
8-5/400 = 1/v
3/400 = 1/v
v= 400/3
v =133.34 cm
it means it is real and it is formed outside of the lens. it is enlarged image.
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