[" A magnifying glass is a combination of a convex "],[" lens of focal length "5cm" and a concave lens of "],[" power "-5D" .If the distance of distinct vision is "],[20cm," calculate the magnifying power of the "],[" magnifying glass."]

A magnifying glass is a combination of a convex lens of focal length 5 cm and a concave lens of power - 5D. If the distance of distinct vision 20 cm, calculate the magnifying power of the magnifying glass.

A magnifying glass is made of a combination of a convergent lens of power 20D and and divergent lens of power 4D. If the least distance of distinct vision is 25cm. The magnifying power is

A magnifying glass is made of a combination of a convergent lens of power 20D and divergent lens of power 4D. If the least distance of distinct vision is 25cm. The magnifying power is

[" A magnifying glass is made of a "],[" combination of a convergent lens of "],[" power "20D" and divergent lens of power "],[" 4D.If the least distance of distinct vision "],[" is "25cm." The magnifying power is "],[[" (A) "7,5],[" (B) "," (C) "3],[" (D) "8]]

Calculate the magnifying power of a magnifier of focal length 2.5 cm.

" If the focal length of a magnifier is "5cm" calculate,the magnifying power of the lens for relaxed eye "

A convex lens of 40 cm focal length is combined with a concave lens of focal length 25 cm. The power of combination is