Home
Class 12
PHYSICS
When light is incident on a soap film of...

When light is incident on a soap film of thickness `5xx10^(-5)` cm, the wavelength of light reflected maximum in the visible region is 5320 Å. Refractive index of the film will be,

A

1.22

B

1.33

C

1.51

D

1.83

Text Solution

Verified by Experts

The correct Answer is:
B
The condition for constructive interference. ( for reflection)
`2mut cosr = (2n + 1) lambda/2 [cos r - 1]`
`mu = ((2n + 1) lambda)/(4t)`
For visible region, n = 2
`mu = ((2(2) + 1) xx 5320 xx 10^(-10))/(4 xx 5000 xx 10^(-10))=1.33`
Promotional Banner

Topper's Solved these Questions

  • SAMPLE PAPER - 18 (UNSOLVED)

    FULL MARKS|Exercise PART - II|9 Videos

  • SAMPLE PAPER - 18 (UNSOLVED)

    FULL MARKS|Exercise PART - III|9 Videos

  • SAMPLE PAPER - 17 (UNSOLVED)

    FULL MARKS|Exercise PART-IV|10 Videos

  • SAMPLE PAPER - 19 (UNSOLVED)

    FULL MARKS|Exercise PART - IV|10 Videos

Similar Questions

Explore conceptually related problems

If the velocity of light in a medium is 2.25 xx 10^(8) ms^(-1) then the refractive index of the medium will be

First diffraction minimum due to a single slit of width 1.0xx10^(-5) cm is at 30^@ . Then wavelength of light used is,

White light is incident normally on a glass plate of thickness 0.50 xx 10^(-6) and index of refraction 1.50. Which wavelength in the visible region (400 nm - 700 nm) are strongly reflacted by the plate ?

If the speed of light in a medium is 1.5xx10^(8)m//s , what is the absolute refractive index of the medium ?

At what angle should a ray of light be incident on the face of a prism of refracting angle 60^(@) so that it just suffers total internal reflection at the other face ? The refractive index of the material of the prism is 1.524

A parallel beam of white light is incident normally on a water film 1.0 x 10^-4 cm thick. Find the wavelength in the visible range (400 nm-700 nm) which are strongly transmitted by the film Refractive index of water = 1.33.