MCQs of Waves Optics

Waves Optics MCQs

MCQs of Waves Optics

Showing 101 to 110 out of 131 Questions

101.

What should be wavelength of light to get 5^th bright fringe at a point where 3^rd bright fringe is obtained using wavelength 700 nm in Young's experiment ?

(a)	420 nm
(b)	500 nm
(c)	750 nm
(d)	630 nm

102.

Ray of light moving in water incidens on glass plate. Reflected light becomes completely plane polarised when incident at 51°, so refractive index of glass will be _____[Refractive index of water = 1.3 and tan51° = 1.235]

(a)	1.33
(b)	1.805
(c)	1.605
(d)	1.305

103.

At which angle of incidence light reflected from glass becomes completely plane polarised ? At this angle of incidence angle of refraction is 33.6° ?

(a)	90°
(b)	0°
(c)	56.4°
(d)	46.4°

104.

In Young's experiment, distance between two slits is 0.28 mm and distance between the slit and the screen is 1.4 m. If distance between central bright fringe and third fringe is 0.9 cm, wavelength of light used in Young's experiment is _____

(a)	6000Å
(b)	5000Å
(c)	4000Å
(d)	3000Å

105.

What will be angle of first order maxima obtained by Fraunhoffer diffraction by single slit using light of wavelength 500 nm ?

(a)	1.5 × 10^-4 radian
(b)	1.5 × 10^-3 radian
(c)	1 × 10^-3 radian
(d)	3 × 10^-3 radian

106.

In Young's experiment fringe is obtained 1m away using two coherent sources 0.9mm apart. If second dark fringe is 1mm away from the central bright fringe , what will be wavelength of monochromatic light used ?

(a)	60 × 10^-4 cm
(b)	10 × 10^-4 cm
(c)	10 × 10^-5 cm
(d)	6 × 10^-5 cm

107.

Which phenomena shows particle nature of light ?

(a)	Refraction
(b)	Interference
(c)	Polarisation
(d)	Photoelectric effect

108.

If waves of light having intensity I₁ and I₂ passes through any region in the same time in the same direction, what will be the sum of maximum and minimum intensity ?

(a)	$I_{1} + I_{2}$
(b)	${(\sqrt{I_{1}} + \sqrt{I_{2}})}^{2}$
(c)	${(\sqrt{I_{1}} - \sqrt{I_{2}})}^{2}$
(d)	$2 (I_{1} + I_{2})$

109.

In Young's experiment, the point where path difference is

\frac{λ}{6} (λ wave length of light)

intensity of light = _____

(a)	$\frac{3}{4}$
(b)	$\frac{1}{\sqrt{2}}$
(c)	$\frac{\sqrt{3}}{2}$
(d)	$\frac{1}{2}$

110.

The wavelength of a given light in air and medium is λ_{a} and λ_{m} respectively . If θ is the polarization angle, then the relation between λ_{a}, λ_{m} and θ is_____

(a)	$λ_{m} = λ_{a} \tan^{2} θ$
(b)	$λ_{a} = λ_{m} cotθ$
(c)	$λ_{m} = λ_{a} cotθ$
(d)	$λ_{a} = λ_{m} \tan^{2} θ$

Showing 101 to 110 out of 131 Questions