MCQs of Ray Optics & Optical Instruments

Ray Optics & Optical Instruments MCQs

MCQs of Ray Optics & Optical Instruments

Showing 41 to 50 out of 143 Questions

41.

A defect of vision in which lines in in one plane of an object appear in focus while those in another plane are out of focus is called _____ .

(a)	distortion
(b)	astigmatism
(c)	myopia
(d)	hypermetropia

42.

Antistokes lines is Raman, scattering are the lines of _____ frequency and _____ wavelength.

(a)	low, high
(b)	high, high
(c)	low, low
(d)	high, low

43.

The time taken by the sunlight to reach the bottom of a tank of depth 4.5 m filled completely with water is _____ ns. The refractive index of water is

\frac{4}{3}

(a)	2
(b)	1.5
(c)	20
(d)	200

44.

A ray of light passes from a medium A having refractive index 1.6 to the medium B having refractive index 1.5. The value of critical angle of medium A is _____ .

(a)	$\sin^{- 1} (\frac{16}{15})$
(b)	$\sin^{- 1} (\frac{1}{2})$
(c)	$\sin^{- 1} \sqrt{\frac{16}{15}}$
(d)	$\sin^{- 1} (\frac{15}{16})$

45.

The power of plane mirror is _____ .

(a)	∞
(b)	2 D
(c)	0
(d)	4 D

46.

Light waves travel from optically rarer medium to optically denser medium. Its velocity decreases because of change in _____ .

(a)	frequency
(b)	amplitude
(c)	wavelength
(d)	phase

47.

If the wavelength of light is 4000

\overset{\circ}{A}

, then the number of waves in 1 mm length will be _____ .

(a)	25
(b)	250
(c)	2500
(d)	25000

48.

According to the modern theory of physics, the light has _____ .

(a)	wave nature only
(b)	particle nature only
(c)	both wave and particle nature
(d)	neither particle nor-wave nature

49.

The velocity of light is maximum in _____ .

(a)	vacuum
(b)	glass
(c)	water
(d)	diamond

50.

Ray optics is valid, when size of object is _____ .

(a)	of the order of one mm
(b)	of the same order as wavelength of light
(c)	much larger than the wavelength of light
(d)	much smaller than the wavelength of light

Showing 41 to 50 out of 143 Questions