Question

Two thin lenses of power -2.5 D and +4.5 D are placed in contact, then the power and focal length of lenses combined is
a)+2 D, +200cm
b)+2 D, +100cm
c)+100 D, +150 cm
d) +1D, +200 cm​

Answer 1

Answer:

Simply add both powers are you in 10th standard ??

Answer 2

Answer:

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