Q. 45.0( 4 Votes )
Two lenses of pow
Answer :
Power P1 = -3.5D; P2 = +1D
Total power = P1 + P2 = -3.5D + 1D
⇒ Total power (P) = -2.5D.
Now;
P (in diopter) = 
⇒ -2.5 = 
⇒ 
⇒ 
Now 1m = 100cm
⇒ -0.4m = -40cm
Hence the focal length of lens is -40cm.
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