Two thin lenses having focal length + 20 centimetre and minus 30 centimetre Putin contact that we have a cinematic lens find the focal length is doubled what will be the conversion power is the focal length of 2 lens is made the same
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f=+20 cm means it is a convex lens
f=-30 cm means it is a concave lens
p=100/20(cm)
=+5cm
p=100/-30(cm)
=-3.33cm
f=-30 cm means it is a concave lens
p=100/20(cm)
=+5cm
p=100/-30(cm)
=-3.33cm
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