subjective , objective and numericals

Is intensity of sound subjective or objective in nature ?

Find the minimum magnification of a microscope, whose objective's numerical apertune is sin alpha = 0.24 , at which the resolving power of the objective is totally employed if the diameter of the eye's pupil is d_(0) = 4.0mm .

To participate in a discussion, one should read the topic, A. Critically B. Objectively and subjectively C. Superficially D. Constructively

A convex lens of focal length f is placed somewhere in between an object and a screen. The distance between the object and the screen is x . If the numerical value of the magnification produced by the lens is m , then the focal lnegth oof the lens is .

There is a microscope whose objective's numerical aperture is sin alpha = 0.24 , where alpha is the half-angle subtended by the objective's rim. Find the minimum spearation resolved by this microscope when an object is illuminated by light with wavelength lambda = 0.55 mu m .

The numerical aperture of an objective of a microscope is 0.5 and the wavelenght of light used is 5000Å . Its limit of resoluton will be

The numerical aperture of objective of a microscope is 1*12 . The limit of resolution, when light of wavalength 6000 Å is used to view an object is :

In a school library, there are books on the following subjects : English = 500, History = 700, Maths = 800, Science = 900. Draw the pictograph for the above numerical data and answer the following questions. Which subjects have maximum and minimum number of books ?