Home
Class 12
PHYSICS
A narrow slit of width 0.025 cm is place...

A narrow slit of width 0.025 cm is placed in front of a convex lens. The slit is illuminated by a light of wavelength 5896Å and an diffraction fringe pattern is formed on the focal plane of the lens. The third minimum on the left is 3 mm away from the third minimum on the right. Calculate the focal length of the lens.

Text Solution

Verified by Experts

The correct Answer is:
22.1 cm
Promotional Banner

Topper's Solved these Questions

  • DIFFRACTION AND POLARISATION OF LIGHT

    CHHAYA PUBLICATION|Exercise HOTS NUMERICAL PROBLEMS|6 Videos

  • DIFFRACTION AND POLARISATION OF LIGHT

    CHHAYA PUBLICATION|Exercise ENTRANCE CORNER|7 Videos

  • DIFFRACTION AND POLARISATION OF LIGHT

    CHHAYA PUBLICATION|Exercise PROBLEM SET - I|9 Videos

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|16 Videos

  • DIGITAL CIRCUITS

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|6 Videos

Similar Questions

Explore conceptually related problems

A narrow slit of width d is placed in front of a convex lens of focal length 0.5 m. the slit is illuminated normally by a light of wavelength 5.89 xx 10^(-7) m. If the distance between two first minima on the either side of central maximum is 2xx10^(-3) m, calculate the width d of the slit.

A single narrow slit of width 0.1 mm, is illuminated with a parallel beam of light of wavelength 600xx10^(-9) m . An diffraction fringe is formed on a screen 40 cm away from the slit. At what distance, will the third minimum band be formed from the central maximum band?

A slit of width a is illuminated by red light of wavelength 650 nm. The first diffraction minimum is observed at an angle theta_(1) = 5.2^(@) from the direction of the incident beam. The width of the slit a in mm is

A light of wavelength lambda falls on a narrow slit of width d.A diffraction fringe is formed on a screen placed at distance D from the slit. If the linear width of the central maximum equals to the width of the slit, will be the value of D?

A narrow slit of width 0.14 mm is illuminated by monochromatic light. On the screen, placed 2 m away, a diffraction fringe is observed. If the second black band lies 16 mm away from the central bright band, then what is the wavelength of the light used?

The angular width of central maximum of a Fraunhofer diffraction fringe formed by a narrow slit is measured. For this, the slit is illuminated by a light of wavelength 6000 Å. When the slit is illuminated by light of another wavelength, it is found that the angular width decreases by 30%. Find the wavelength of the light used in the second case. Now, in the first case, the total set-up of the experiment is immersed in a liquid. It is found that, the angular width of central maximum decreases by same amount. Calculate the refractive index of the liquid.

A parallel beam of light of 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Calculate the width of the slit.

A narrow slit of width 'a' is illuminated by a light of wavelength 6000Å. For what value of 'a' do the following events occur?- ii. First minimum falls at an angle of diffraction of 30^(@)