If f is the focal length of the camera lens and ? is the angle of tilt, the dist

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Question
If f is the focal length of the camera lens and ? is the angle of tilt, the distance of the plumb point from the principal point will be
Options
A. f sin ?
B. f cos ?
C. f tan ?
D. f sec ?.

Correct Answer

f tan ?

More questions

1. If normal stresses due to longitudinal and transverse loads on a bar are ?₁ and ?₂ respectively, the normal component of the stress on an inclined plane ?° to the longitudinal load, is
Options
A. ?₁ sin ? x ?₂ cos ?
B. ?₁ sin ?² + ?₂ cos² ?
C.
D.

2. In tropical regions,
Options
A. the surface gets heated more effectively than the arctic areas
B. after heating, the air becomes lighter and is displaced by cool air from the polar regions
C. the rising tropical air flows towards the polar region in the upper strata
D. all of the above.

3. A low wall built out into the sea more or less perpendicular to the coast line, to resist the travel of sand and shingle along a beach, is called
Options
A. break water
B. break wall
C. groins
D. shore wall.

4. If two forces each equal to T in magnitude act at right angles, their effect may be neutralised by a third force acting along their bisector in opposite direction whose magnitude will be
Options
A. 2 T
B. 1/2 T
C. 2 T
D. 3 T
E. none of these.

5. Pick up the incorrect statement from the following: In a dry dock block made of hard wood,
Options
A. spacing of the blocks is 1.35 m
B. the lowest block is 1.8 m long 40 cm x 40 cm in cross-section
C. the middle block is 1.6 m long 40 cm x 40 cm in crosss-section
D. the top block is 1.2 m long 40 cm x 40 cm in cross-section
E. none of these.

6. Pick up the correct statement from the following:
Options
A. the Mediterranean sea is considered to be a huge harbour
B. the Caspean sea is considered to be a big harbour
C. the Red sea is considered to be harbour
D. none of the above.

8. Pick up the correct statement from the following:
Options
A. Blistering may be cured by applying water paint finished with oil paint dried with a little copal varnish
B. Cracked paints may be cured by removing paint and giving a fresh coat of paint
C. Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps
D. All the above.

10. If the axial length of a drainage basin is 35 km and its form factor is 0.2, the total area of the basin is
Options
A. 205 sq. km.
B. 215 sq. km.
C. 225 sq. km.
D. 235 sq. km.
E. 245 sq. km.

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