A long sighted person has a least - distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a :

A long sighted person has a least - distance of distinct vision of 50

1.	A long sighted person has a least - distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a :
Answer» CONCAVE lens of FOCAL length 50 cm convex lens of focal length 25 cm convex lens of focal length 50 cm concave lens of focal length 25 cm Solution :(B) Nearest POINT = 100 cm, far point = `oo` `(1)/(F) = (1)/(oo) - (1)/(100) rArr f = - 100 cm`

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A long sighted person has a least - distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a :

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