Why are the magnification properties of microscopes and telescopes defined in terms of the ratio of angles and not in terms of the ratio of sizes of objects and images?

Compare the intensities of maxima and minima in terms of amplitude ratio

__________ is defined as the ratio of the heigth of the image to the heigth of a object.

Why has second been defined is terms of periods of radiations from cesium -133?

The ratio of 6th and 8th term of an A.P. is 7.9. Find the ratio of 9th to 13th term.

The ratio between any two consecutive terms of the G.P. is …… and it is called ……

If the arithmetic progression whose common difference is nonzero the sum of first 3n terms is equal to the sum of next n terms. Then, find the ratio of the sum of the 2n terms to the sum of next 2n terms.

Two arithmetic progressions have the same numbers. The reatio of the last term of the first progression to the first term of the second progression is equal to the ratio of the last term of the second progression to the first term of first progression is equal to 4. The ratio of the sum of the n terms of the first progression to the sum of the n terms of teh first progression to the sum of the n terms of the second progerssion is equal to 2. The ratio of their first term is

Find the 12th term of a G.P. whose 8th term is 192, and the common ratio is 2.

The coefficients of three consecutive terms in the expansion of (1 + a)^n are are in the ratio 1: 7: 42 Find n.

In a GP , the ratio of the sum of the first eleven terms of the sum of the last even terms is 1//8 and the ratio of the sum of all the terms without the first nine to the sum of all terms without the last nine is 2 . Then the number of terms in the GP is