Student Login

Home›Chapters›Wave Optics PYQs›YDSE: Film, Medium & Two Wavelengths›Question 65

NEET 2016 (Phase 1) · YDSE: Film, Medium & Two Wavelengths

YDSE: Film, Medium & Two Wavelengths question from NEET 2016 (Phase 1)

Q65NEET 2016 · PHASE 1Medium

YDSE: Film, Medium & Two Wavelengths

The intensity at the maximum in a Young's double slit experiment is $I$ 0. Distance between two slits is d = 5 $\lambda$ , where $\lambda$ is the wavelength of light used in the expreriment. What will be the intensity in front of one of the slits on the screen placed at a distance D = 10d?

Show answer and solution

Answer: (b)

In front of a slit, $\Delta = \dfrac{d^2}{2D} = \dfrac{d}{20} = \dfrac{5\lambda}{20} = \dfrac{\lambda}{4}$ .
Phase $\phi = \dfrac{2\pi}{\lambda}\Delta = \dfrac{\pi}{2}$ .
$I = I_0\cos^2(\phi/2) = I_0\cos^2\tfrac{\pi}{4} = \dfrac{I_0}{2}$
So the answer is (b) $\frac{I_0}{2}$ .

Report a mistake

More questions on YDSE: Film, Medium & Two Wavelengths

Using monochromatic light of wavelength λ, an experimentalist sets up the Young's double…JEE Main 2014 (9 Apr, Shift 1)
A thin glass plate of thickness 2500/3λ ( λ is wavelength of light used) and refractive…JEE Main 2013 (25 Apr, Shift 1)
In Young's double slit experiment, the slits are 2 mm apart and are illuminated by…NEET 2013
The source that illuminates the double-slit in 'double-slit interference experiment'…JEE Main 2013 (25 Apr, Shift 1)
A mixture of light, consisting of wavelength 590 nm and an unknown wavelength…JEE Main 2009 (AIEEE)
The maximum number of possible interference maxima for slit-separation equal to twice the…JEE Main 2004 (AIEEE)
Interference was observed in interference chamber where air was present, now the chamber…NEET 1993 (AIPMT)
In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole…NEET 1990 (AIPMT)