Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 128

EASY

MHT-CET

IMPORTANT

Earn 100

In Fraunhofer diffraction from a single slit of width $0.3 mm$ , the diffraction pattern is formed in the focal plane of a lens of focal length $1 m$ . If the distance of the third minimum from the central maximum is $5 mm$ , then find the wavelength of light used.

50% studentsanswered this correctly

Important Questions on Interference and Diffraction

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 129

When violet light incident on a narrow aperture is replaced by a blue one, then the diffraction pattern will-

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 130

In Fraunhofer diffraction the centre diffraction image is

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 131

Diffraction effects are more pronounced or easier to notice in the case of sound waves than in the case of light waves, because:

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 132

Diffraction and interference of light suggest, it has -

MEDIUM

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 133

The direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by (

a

is the width of the slit and

θ

is the angular position):

MEDIUM

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 134

Light of wavelength

6328 Å

is incident normally on slit having a width of

0.2 mm

. The width of the central maximum measured from minimum to minimum of diffraction pattern on a screen

9.0

meters away will be about-

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 135

When wave of wavelength

0.2 cm

is made incident normally on a slit of width

0.004 m

, then the semi-angular width of central maximum of diffraction pattern will be-

EASY

MHT-CET

IMPORTANT

Physics Crash Course MHT-CET>Chapter 21 - Interference and Diffraction>Exercise 1>Q 136

A parallel beam of monochromatic light is incident on a narrow rectangular slit of width

1 mm

. When the diffraction pattern is seen on a screen placed at a distance of

2 m

. the width of principal maxima is found to be

2.5 mm

. The wavelength of light is-