A converging lens of power 25 D is used as a simple microscoe.Calculae the magnifying power,if the distance of distinct vision is 25 cm.

What is a microscope? Explain simple microscope. Calculate its magnifying power.

Two lenses of powers 10D - 5D are placed in contact Calculate the power of the new lens.

With the help of ray diagram, describe the constru¬ ction, working of acompound microscope when the final image is formed at least distance of distinct vision (D = 25 cm). Derive an expression for its magnifying power (m)

The focal length of th eye-piece and ojective a compound microscope are 5 cm and 1 cm respectively and the length of the tube is 20 cm.Calculate he magnifying power of the microscope,when the final image is formed at infinity .The value of least distance of ditinct vision is 25cm.

A telescope has an objective of focal length 50 cm and eye-piece of focal length 5 cm.the last distance of distinct vision is 25 cm.The telescope is focussed for ditinct vision on a scale 200 cm awya from teh objective.Caculate the sepration between the objective and eye-piece

A telescope has an objective of focal length 50 cm and eye-piece of focal length 5 cm.the last distance of distinct vision is 25 cm.The telescope is focussed for ditinct vision on a scale 200 cm awya from teh objective.Caculate the magnification produced.

With the help of labelled diagram, give the principle and magnifying power of compound microscope, when final image is formed at least distance of distinct vision.