To observe diffraction, the size of an obstacle,

Important Questions on Interference and Diffraction of Light

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 57

Yellow light is used in a single slit diffraction experiment with slit-width of $0.6 \mathrm{mm}$. If yellow light is replaced by $X$-rays, then the observed pattern will reveal,

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 58

In Fresnel's class of diffraction, the:

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 59

The $X$-rays cannot be diffracted by means of an ordinary grating due to:

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 60

When the diffraction pattern from a certain slit illuminated with laser light $\left(\lambda =6330 \stackrel{°}{\mathrm{A}}\right)$ is projected on a screen $150 \mathrm{cm}$ from the slit, the second minima on each side are separated by $8 \mathrm{cm}$. This tells us that:

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 61

A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light?

MEDIUM

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 62

Light of wavelength $6328 \stackrel{°}{\mathrm{A}}$ is incident normally on a slit having a width of $0.2 \mathrm{mm}$. The width of the central maximum measured from minimum to minimum of diffraction pattern on a screen $9 \mathrm{m}$ away will be nearly

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 63

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is:

EASY

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 8 - Interference and Diffraction of Light>Objective Problems [Level 1]>Q 64

In the diffraction pattern of single slit under bichromatic illumination, the first minimum with the wavelength ${\lambda }_1$ is found to be coincident with the third maximum at ${\lambda }_2.$ So