MCQs of Waves Optics

Waves Optics MCQs

MCQs of Waves Optics

Showing 91 to 100 out of 131 Questions

91.

For a given slit, ratio of diffraction angle of fringes of first maxima and first minima is _____

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

92.

If diffraction angle first minima of Fraunhoffer diffraction is

\frac{π}{6}

, width of slit d = _____

(a)	$λ$
(b)	$2 λ$
(c)	$\frac{λ}{2}$
(d)	$\frac{λ}{6}$

93.

Diameter of lens of telescope is 0.16 m. Wavelength of light is 7500Å, so resolving power of telescope will be _____

(a)	6.67 × 10⁵
(b)	6.67 × 10⁶
(c)	6.67 × 10²
(d)	6.67 × 10⁴

94.

Point like object is observed using microscope angle subtended by objective with object is 20° If oil of refractive index 1.4 is kept between object and objective, numerical aperture will be _____

(a)	0.24
(b)	0.48
(c)	2.4
(d)	4.8

95.

Natural light is _____

(a)	plane polarised
(b)	unpolarised
(c)	tropically polarised
(d)	perpendicularly polarised

96.

When polaroid is rotated intensity of light increases and decreases but never becomes zero, so we can say that incident light is _____

(a)	completely plane
(b)	partially plane polarised
(c)	unpolarised
(d)	none of these

97.

If light of intensity

I_{0}

is incident at an angle 60° with optical axis of polaroid, so intensity of emerging light is ______

(a)	$I_{0}$
(b)	$\frac{I_{0}}{2}$
(c)	$\frac{I_{0}}{\sqrt{2}}$
(d)	$\frac{I_{0}}{4}$

98.

Ray of light is incident on surface of glass plate of absolute refractive index is 1.55 at an angle of polarisation angle of refraction = _____

(a)	75°11′
(b)	32°49′
(c)	147°11′
(d)	0°

99.

If angle of polarisation on transparent medium is 51°, refractive index of medium is _____

(a)	0.7771
(b)	0.7547
(c)	1.2349
(d)	1.1504

100.

Which physical quantity changes during polarisation of light ?

(a)	Frequency
(b)	Wavelength
(c)	Phase
(d)	Intensity

Showing 91 to 100 out of 131 Questions