1.

Calculate the focal length of a reading glass of a person if his distance of distinct vision is 75 cm.

Answer»

100.4cm
75.2cm
37.5cm
25.6cm

Solution :`V= - 75cm, u= -25CM`
`(1)/(F) = (1)/(u) + (1)/((-v)) = (1)/(25) + (1)/(-75) = (2)/(75) rArr f= (75)/(2)` we get f= 37.5cm


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