Two lenses of focal lengths 20 cm and – 40 cm are held in contact. Where will the image of an object at infinity be formed by the combination ?
Answer & explanation
Correct answer: option 3
f = \(\frac{f1 . f2}{f1 + f2}\)
Two lenses of focal lengths 20 cm and – 40 cm are held in contact. Where will the image of an object at infinity be formed by the combination ?
Correct answer: option 3
f = \(\frac{f1 . f2}{f1 + f2}\)