351.  Assertion : An optical component known as parallel plate is widely used in surveying instruments. Reason : This displaces a beam of light without changing its direction as there is no effect of colour dispersion.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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352.  Assertion : The complete achromatism can not be achieved by the use of only flint glass and crown glass. Reason : The ratio of their dispersive powers varies at different parts of the spectrum.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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353.  Assertion : The component rays of a beam proceeding from a point on the principal axis are not refracted to pass through a single point. Reason : They are focussed differently according to their positions of incidence on the lens.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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354.  Assertion : The Galileo's telescope is not suitable for surveying instruments. Reason : It does not produce a real image.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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355.  Assertion : The interior of the body of internal focusing telescope is pointed dull black. Reason : It prevents reflection from internal surfaces of the telescope.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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356.  Assertion : The most convenient and sensitive device for determining the position of a horizontal and a vertical plane is the bubble tube. Reason : The action of bubble tubes depends on the fact that the free surface of still liquid is a level surface.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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357.  Assertion : The flat top with a control screw is provided in the theodolite tripod. Reason : It is possible to provide 30 or 40 mm of lateral adjustments to facilitate the precise centering of the instrument over a ground mark.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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