Answer the following questions: Why must both the objective and the eyepiece of a compound microscope have short focal lengths?

Define the magnifying power of a compound microscope when the final image is formed at infinity. Why must both the objective and the eye piece of a compound microscope has short focal length? Explain.

Answer the following questions: When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece?

The magnifying power an astronomical telescope in the normal adjustment position is 100. The distance between the objective and the eyepiece is 101 cm. calculate the focal length of the objective and the eyepiece.

Answer the following questions: Why does the reverse current show a sudden increase at the critical voltage?

Answer the following questions: Magnifying power of a simple microscope is inversely proportional to the focal length of the lens. What then stops us from using a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power?

Answer the following questions: Why is diamagnetism, in contrast, almost independent of temperature?

Answer the following questions: Why is the current under reverse bias independent to the applied potential up to a critical voltage?

The focal lengths of the objective and eye-piece of a compound microscope are 4 cm and 6 cm respectively. If an object is placed at a distance of 6 cm from the objective, what is the magnification produced by the microscope? Distance of distinct vision = 25 cm.

Answer the following question: Long distance radio broadcasts use short-wave bands. Why?