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Forensic Photography: Triad, ABFO Scale and Basic Practice
Published:
Questions
30
Duration
30 min
Faculty-reviewed
0
Updated
24 May 2026
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Published:
Questions
30
Duration
30 min
Faculty-reviewed
0
Updated
24 May 2026
Score, per-question explanations and topic breakdown shown right after you submit.
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UGC-NET Forensic Science Paper II Unit VI drill on forensic photography at the foundations level. Items work through the photographic triad (overall establishing shot, mid-range contextual shot, and close-up detail shot) and why shooting in that fixed sequence prevents the viewer from losing spatial orientation as magnification increases. The ABFO No 2 scale is examined from its origins in forensic odontology (bite-mark documentation) through its L-shaped form, millimetre and centimetre graduations, and the requirement to place it precisely in the same focal plane as the evidence surface so that a true 1:1 reproduction ratio is achievable at the enlargement stage.
Camera fundamentals covered include the structural difference between DSLR and mirrorless bodies, full-frame versus APS-C sensor coverage, the aperture (f-number) and its effect on depth of field, shutter speed as the control for motion freezing, and the ISO triangle that balances sensitivity against noise. Lighting items distinguish the on-camera flash limitations at close range from the advantages of a ring flash for bite marks and wounds, and explain how oblique (raking) light at a low angle enhances surface topography in impression evidence such as tyre tracks and tool marks. Tripod and stabilisation items cover long-exposure and low-light scenes, mirror lock-up and remote shutter release, and the copy-stand setup for flat evidence photography.
Geometry items cover the orthogonal (perpendicular-axis) requirement for 1:1 documentation and how angular deviation introduces perspective distortion that invalidates scale comparisons. Indian CFSL practice items address photographs as expert opinion evidence under Section 39 of the Bharatiya Sakshya Adhiniyam 2023 (replacing Section 45 of the Indian Evidence Act 1872), chain-of-custody documentation for digital image files, cryptographic hash values (MD5 or SHA-256) for verifying file integrity, and the photo-log as part of the formal case record. Allow 30 minutes.
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