MCQs of Waves Optics

Waves Optics MCQs

MCQs of Waves Optics

Showing 81 to 90 out of 131 Questions

81.

In Young's experiment, if distance between two consecutive fringes is 0.01 cm distances of 5^th bright fringe and 5^th dark fringe from the central maximum will be _____ respectively.

(a)	0.050 cm and 0.040 cm
(b)	0.050 m and 0.045 m
(c)	0.050 cm and 0.045 cm
(d)	0.050 cm and 0.045 m

82.

In Young's experiment distance between 5^th dark fringe and 3^rd dark fringe is x₅-x₃ = ______

\bar{x}

(a)	2
(b)	3
(c)	$\frac{2}{3}$
(d)	$\frac{3}{2}$

83.

Ratio of intensities of two waves is 4 : 1 what will the ratio of their amplitudes ?

(a)	3 : 1
(b)	4 : 1
(c)	9 : 1
(d)	16 : 1

84.

In Young's double slit experiment, the point where path difference is λ, intensity at that point on screen is I. What will be intensity at the point where path difference is

\frac{λ}{8}

(a)	$\frac{I}{4}$
(b)	$\frac{I}{2}$
(c)	$I$
(d)	zero

85.

In a Young's experiment ratio of maximum and minimum intensities of fringes is 9 : 1. Ratio of amplitude of superposing waves = _____

(a)	9 : 1
(b)	3 : 1
(c)	2 : 1
(d)	1 : 1

86.

Time taken by sunlight to pass through window of 4 mm thickness and 1.5 refractive index will be _____

(a)	2 × 10^-4 s
(b)	2 × 10⁸ s
(c)	2 × 10^-11 s
(d)	2 × 10¹¹ s

87.

In diffraction patterns obtained due to single slit _____

(a)	all bright fringes are having same intensities.
(b)	as order of maxima increases, intensity increases
(c)	as order of maxima increases, intensity decreases
(d)	none of above

88.

Both sound and light have wave have characteristic but diffraction of light is negligible because _____

(a)	speed of light is very much.
(b)	wavelength of light is too less.
(c)	light does not require medium for propogation
(d)	light waves are transverse waves

89.

Frequency of sound wave is 600 Hz. This wave incidens perpendicular to open door of width 0.75m. At which angle is the first minima obtained ? (Speed of light in air = 330 ms^-1.)

(a)	20.8°
(b)	45°
(c)	47.2°
(d)	83.6°

90.

What will be the diffraction angle of first order maxima in diffraction obtained due to light of wavelength 55mm and width of slit 0.55 mm ?

(a)	0.0015 radian
(b)	0.00015 radian
(c)	0.003 radian
(d)	0.0010 radian

Showing 81 to 90 out of 131 Questions