Solve my doubt please

Dear student
option a is the answer

 Defective near vision, v = -75cm

Now, lens formula for this,

1/v + 1/25 = 1/f

=> 1/(-75) + 1/25 = 1/f

=> 2/75 = 1/f

=> f = 75/2 cm

So, power of the lens, P = 1/f

=> P = (100/(75/2)) D

=> P = 2.667 D
approx 2.67D
Regards

 

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