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 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 and divergent lens of power 4D. If the least distance of distinct vision is 25cm. The magnifying power is

A convex lens of focal length 10 cm and imag formed by it, is at least distance of distinct vision then the magnifying power is

A convex lens of focal length 10 cm and imag formed by it, is at least distance of distinct vision then 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]]

A magnifying glass is a combination of lenses of powers +20 D and -5 D . Calculate the magnifying power of the microscope, if the distance of distinct vision is 25 cm. Also, calculate the size of an object 3 cm high seen through the magnifying glass.

If the focal length of objective lens is increased then magnifying power of the