### Physics - Wave Optics

#### Question - 1

When light travels from an optically rarer medium to an optically denser medium,the velocity decreases because of change in

• A Wavelength
• B frequency
• C amplitude
• D phase

#### Question - 2

Which of the following phenomena is not common to sound and light waves?

• A Interference
• B Diffraction
• C Coherence
• D Polarisation

#### Question - 3

Huygen's wave theory could not explain

• A interference
• B diffraction
• C polarisation
• D photoelectric effect

#### Question - 4

When light wave suffers reflection at the interface from air to glass,the change in phase of the reflected light is equal to

• A 0
• B ${\pi} / { 2 }$
• C $\pi$
• D $2{\pi }$

#### Question - 5

Light travels faster in air than in glass according to

• A wave theory of light
• B corpuscular theory of light
• C electromagnetic theory of light
• D quantum theory of light

#### Question - 6

Ray optics is valid, when characteristic dimensions are

• A much smaller than the wavelength of light
• B much larger than the wavelength of light
• C of the same order as the wavelength of light
• D of the order of one millimetre

#### Question - 7

According to modern theory for nature of light,light has

• A wave nature
• B particle nature
• C quantum nature
• D both particle and wave(dual)nature

#### Question - 8

In a double slit interference experiment,the distance between the slits is 0.05 cm and screen is 2m away from the slits. the wavelength of lights is $8.0\times { 10 }^{ -5 }$cm.The distance between successive fringes is

• A 0.24 cm
• B 0.16 cm
• C 0.32 cm
• D 0.48 cm

#### Question - 9

The young's double slit experiment is performed with blue and green light of wavelengths 4360 $\mathring { A }$ and 5460 $\mathring { A }$ respectively.If y is the distance of 5th maximum from the central one, then

• A y (blue)=y (green)
• B y (blue)< y (green)
• C y (blue) < y (green)
• D y (blue) / y (green)=5460/4360

#### Question - 10

In the young's double slit experiment, the two slits ${S}_{1}$and ${S}_{2}$are not equidistant from the monochromatic light source slit S which is illuminating them.Then, the central fringe is

• A always bright
• B always dark
• C uniformly illuminated
• D either dark or bright depending on the position of S.