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The correct answer is varies inversely as the square of.

The brightness of the image varies inversely with the square of the magnifying power. As magnifying power increases, the brightness of the image typically decreases because the light is spread over a larger area.

The correct answer is axis of the level tube.

The axis of the level tube is the imaginary line that is tangential to the longitudinal curve of the level at the center of the axis.

The correct answer is all of these.

Traversing by the method of deflection angles is used in various types of surveying projects, including canals, highways, and railways. It involves measuring the angles of deflection from a baseline to establish the alignment and positions of the survey lines.

The correct answer is 100.

The multiplying constant for a tachometer is generally kept as 100. This constant is used to convert the readings from the tachometer into actual distances or heights, simplifying the calculations.

The correct answer is more than 250 km².

The curvature of the Earth is typically taken into consideration for surveys that cover areas greater than 250 km². For smaller areas, the curvature is usually negligible and can be ignored in most practical surveying tasks.

The correct answer is the departure is positive and latitude is negative.

When the whole circle bearing of a traverse line is between 180° and 360°, the latitude (northing component) is negative, and the departure (easting component) is positive.

The correct answer is plane tabling.

In plane tabling, field work and plotting work are done simultaneously. The plane table is set up in the field, and the surveyor plots the points on the map as they are observed.

The correct answer is datum surface.

A datum surface is an arbitrary surface with reference to which the elevation of points are measured and compared. It serves as a base level for measuring and recording elevations.

The correct answer is real and inverted.

In a telescope, the image formed by the objective lens is real and inverted when it is projected onto the plane of the cross hairs.

The correct answer is axis of level tube.

The axis of the level tube is the imaginary line tangential to the longitudinal curve of the bubble tube at its middle point. This axis helps ensure that the level is properly aligned for accurate measurements.