Q: Two convex lenses have focal lengths of 50 cm and 25 cm, respectively. If these two lenses are placed in contact, then the net power of this combination will be equal to
(a)+2 dioptre
(b)+6 dioptre
(c)-6 dioptre
(d)+3 dioptre
Correct Answer: (b)
The correct answer is (b) '+6 डायोप्टर'. This question from the General Studies domain tests knowledge of Miscellaneous.