If the focal length of the biconvex lens is 25 cm, then the – McqOptions

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1.	If the focal length of the biconvex lens is 25 cm, then the power of the lens will be [NDA]
A.	+ 4 dioptre
B.	- 4 dioptre
C.	+ 0.04 dioptre
D.	- 0.04 dioptre
Answer» B. - 4 dioptre

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