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In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wave-length

), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is

(a)

(b)

/ 3

(c)

/ 3

(d)

Chemistry

The correct order of radii is

(a)

N < Be < B

(b)

F ^- < O^2- < N^3-

(c)

Na < Li < K

(d)

Fe³⁺ < Fe²⁺ < Fe⁴⁺

Mathematics

Which one of the following curves cut the parabola y² = 4ax at right angles?

(a)

x² + y² = a²

(b)

y = e ^-x/2a

(c)

y = ax

(d)

x² = 4ay

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