# Surveying Questions and Answers – Photogrammetric Surveying – Stereoscopic Vision

This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Photogrammetric Surveying – Stereoscopic Vision”.

1. The distance between nodal point and the plane of the photograph depends on the __________
a) Focal length of the mirror
b) Aperture
c) Line of sight
d) Focal length of the lens

Explanation: Focal length of the lens depends up on the type of lens being used. This may affect the distance between nodal point and the plane of the photograph. These are used in the determination of the scale of the photograph.

2. Minimum 4 mirrors are used in case of a mirror stereoscope.
a) True
b) False

Explanation: Stereoscope is an instrument which is used in viewing stereo pairs. These are classified as mirror stereoscope and lens stereoscope, among the mirror stereoscope uses a minimum of 4 mirrors for propagation.

3. Which of the following doesn’t indicate the purpose of stereoscope?
a) Relation between convergence and accommodation
b) Line of sight justification
c) Perception of depth
d) Assisting eyes on the image

Explanation: The purpose of stereoscope involves in assisting the eyes on the image, establishing a relation between convergence and accommodation and magnifying perception of depth.

4. Which of the following indicates the correct set of Stereoscope classification?
a) Mirror stereoscope and prism stereoscope
b) Mirror stereoscope and plane table stereoscope
c) Mirror stereoscope and lens stereoscope
d) Lens stereoscope and plane table stereoscope

Explanation: The stereoscope classification generally involves mirror stereoscope and lens stereoscope. Both of them can be employed based on the type of material available that is either a mirror of lens.

5. Which of the following processes help in placing the image on fovea?
a) Convergence
b) Magazine
c) Focal length
d) Aperture

Explanation: Convergence involves in placing the image on fovea. It is necessary that the image of the object sighted is placed on the sensitive part of the eye. Convergence can act as a clue to the distance between object and observer.
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6. Which of the following is involved in obtaining spatial relation?
a) Focal length
b) Binocular vision
c) Polarization
d) Telescopic vision

Explanation: Spatial relation involves establishing a three dimensional view of the field which is sighted. This can be established by a binocular vision. It is having the capability of determining the impression of depth.

7. Which of the following won’t serve as a reason for the impression of depth?
a) Relative size of objects
b) Light effects
c) Calculation of azimuth
d) Simultaneous view

Explanation: Impression of depth can be caused due to the relative size of the objects which can be near or far, effects caused due light and in shade and viewing an object with both eyes simultaneously. These are able to establish a three-dimensional view of the field.

8. The stereoscopic vision can be applied to ____________
a) Photogrammetry
b) Theodolite surveying
c) Traversing
d) Compass surveying

Explanation: The principle of stereoscopic vision involves producing a three-dimensional image. It is fore most required in the process of photogrammetry as its main theme is to capture the maximum area.

9. Lens used in the stereoscope can be flattened by which among the following methods?
b) Divergence
c) Convergence
d) Accommodation

Explanation: Accommodation is the process involved in obtaining a flattened lens. Because of the accommodation process, we might be able to determine the approximate depth. We can have less strain on our eyes.

10. The difference between the images on retina is given as __________
a) Retinal disparity
b) Stereoscopic disparity
c) Difference in retinal
d) Stereoscopic retina

Explanation: The object which we are visualizing is somewhat different from the reality. Due to the combination of the picture from the left eye and right eye positions of the objects can be mismatched. This difference is known as retinal disparity.

11. Which of the following doesn’t come under the ideal conditions of stereoscopic views?
a) Elevation of camera position
b) Measuring iso centric distance
c) Making camera axis vertical
d) Overlapping of photograph

Explanation: Aerial stereoscopic view involves in following certain ideal conditions that are required for proper functioning. They include sufficient overlapping of photographs, the elevation of camera positions, making camera axis vertical for having picture plane in a horizontal plane.

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