Considering the fact that the speed of light in glass is not independent of the colour of light, which of the statement is true?

violet light travels slower than red light

violet light travels faster than red light

violet light travels same as red light

only white light will be travelling.

Which of the following is wrong for interference fringes?

Fringes are due to limited portion of wave front.

Distance between two consecutive fringes are constant.

All bright fringes are equally bright.

Fringes are due to the use of coherent sources.

MEDIUM

NEET

IMPORTANT

Earn 100

In a Fraunhofer diffraction experiment, a single slit of width $0.5 mm$ is illuminated by a monochromatic light of wavelength $600 nm$ . The diffraction pattern is observed on a screen at a distance of $50 cm$ from the slit. What will be the linear separation of the first order minima?

25% studentsanswered this correctly

Important Questions on Wave Optics

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 55

A plane polarised light is passed through successive polarisers which are rotated by

30 °

with respect to each other in the clockwise direction. Neglecting absorption by the polarisers and given that the first polariser's axis is parallel to the plane of polarisation of the incident light, the intensity of light at the exit of the fifth polariser is closest to,

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 56

Two polaroids are kept crossed to each other. If one of them is rotated an angle

60 °

, the percentage of incident light now transmitted through the sytem is

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 57

Two beams, A and B of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30^o makes the two beams appear equally bright. If the initial intensities of the two beams are I_A and I_B respectively, then

\frac{I_{A}}{I_{B}}

equals :

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 58

Unpolarized light of intensity

I

passes through an ideal polariser

A

. Another identical polariser

B

is placed behind

A

. The intensity of light beyond B is found to be

\frac{I}{2}

. Now another identical polariser

C

is placed between

A

and

B

. The intensity beyond B is now found to be

\frac{I}{8}

. The angle between polariser

A

and

C

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 59

A polaroid is placed at

45 °

to an incoming light of intensity

I_{0}

. Now, the intensity of light passing through the polaroid after polarisation would be,

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 60

Three polaroid sheets

P_{1}, P_{2}

and

P_{3}

are kept parallel to each other such that the angle between pass axes of

P_{1}

and

P_{2}

45 °

and that between

P_{2}

and

P_{3}

45 °

. If unpolarised beam of light of intensity

128 W m^{- 2}

is incident on

P_{1}

. What is the intensity of light coming out of

P_{3}

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 61

Two circular linear polarisers are placed coaxially. The transmission axis of the first polariser is

30 °

from the vertical while the second one is at

60 °

, both in the clockwise sense. If an unpolarised beam of light of intensity,

I = 20 W m^{- 2}

is incident on this pair of polarisers, then the intensities

I_{1}

and

I_{2}

transmitted by the first and the second polarisers, respectively, will be close to,

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 18 - Wave Optics>Level 1>Q 62

In a double-slit experiment, the two slits are

1 mm

apart and the screen is placed

1 m

away. A monochromatic light of wavelength

500 nm

is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of single-slit pattern?

In a Fraunhofer diffraction experiment, a single slit of width 0.5 mm is illuminated by a monochromatic light of wavelength 600 nm. The diffraction pattern is observed on a screen at a distance of 50 cm from the slit. What will be the linear separation of the first order minima?

Important Questions on Wave Optics

Learn and Prepare for any exam you want !

In a Fraunhofer diffraction experiment, a single slit of width $0.5 mm$ is illuminated by a monochromatic light of wavelength $600 nm$ . The diffraction pattern is observed on a screen at a distance of $50 cm$ from the slit. What will be the linear separation of the first order minima?