+91-87964 74404
FlagBACK
Question icon
Grade 12th passWave Optics

Minimum thickness of mica sheet having u=3/2 which should be placed in front of one of the slit in YDSE to reduce the intensity at center of screen to half the maximum intensity is.. . ........ ANS:lambda/2

Profile image of Pawan joshi
7 Years agoGrade 12th pass
Answers icon

1 Answer

Profile image of Vikas TU
7 Years ago
For the refractive index 3/2 mica intoduced,
the path difference becomes,
n*lamda = (u-1)*t
n*lamda = (3/2 – 1)*t
t = 2*n*lamda’
 Now ntensity is inversely proportional to the wavelength.
To reduce the intesity to the half, i.e. for
I = 1/lamda
I/2 = 1/lamda’
lamda’ /lamda = 2
or
lamda’ = lamda/2
 
The wavelngth should become twice of the initial value.
t = lamda/2 would be the thikness for n=1.

Other Related Questions on wave optics

question mark

what is meant by refractive index?

wave optics
1 Answer Available

Last Activity: 8 Months ago

question mark
An oscillator consists of a block of mass 512 g connected to a spring. When set into oscillation with amplitude 34.7 cm, it is observed to repeat its motion every 0.484 s. Find (a) the period, (b) the frequency, (c) the angular frequency, (d) the force constant, (e) the maximum speed, and ( f ) the maximum force exerted on the block.
wave optics
1 Answer Available

Last Activity: 4 Years ago

question mark
A PLANE TRANSMISSION GRATING HAS 45000 LINES. DETERMINE ITS RESOLVING POWER IN THE SECOND ORDER FOR WAVELENGTH OF 5000A.
 
wave optics
1 Answer Available

Last Activity: 4 Years ago

question mark
A PLANE TRANSMISSION GRATING HAS 45000 LINES. DETERMINE ITS RESOLVING POWER IN THE SECOND ORDER FOR WAVELENGTH OF 5000A.
wave optics
1 Answer Available

Last Activity: 4 Years ago

question mark
If V-numer of a multi mode fiber is 3. Calculate the no.of modes if it is step index and graded index fiber multimode fiber (rounded off)?
wave optics
1 Answer Available

Last Activity: 4 Years ago