+91-87964 74404
FlagBACK
Question icon
Grade 11Wave Motion

A convex lens of diameter 8.0 cm is used to focus a parallel beam of light of wavelength 620 nm. If the light be focused at a distance of 20 cm from the lens, what would be the radius of the central bright spot formed?

Profile image of Simran Bhatia
12 Years agoGrade 11
Answers icon

1 Answer

Profile image of Aditi Chauhan
12 Years ago
Sol. . For first minimum diffraction, b sin θ = λ Here, θ = 30°, b = 5 cm ⇒ λ = 5 * sin 30° = 5/2 = 2.5 cm.

Other Related Questions on wave motion

question mark
A particle on a speing executes shm when the particle is found at x=xmax/2 the speed of the partcle is 
A)vx=vmax 
B)vx=√3vmax/2
C)vx=√2vmax/2
D)vx=vmax/2
wave motion
1 Answer Available

Last Activity: 4 Years ago

question mark
displacement associated with three dimensional wave is given by sai x y is equal to 1 + 1 by 2 x + root 3 by 2 k x minus omega t show that the wave propagates along a direction making an angle 60 degree with the x-axis
wave motion
1 Answer Available

Last Activity: 4 Years ago

question mark
What do you mean by Energy of Simple Hormonic Motion?
 
wave motion
1 Answer Available

Last Activity: 4 Years ago

question mark
What is mean by motion and time define it's all types with there parts and their s.i. units.
wave motion
1 Answer Available

Last Activity: 4 Years ago

question mark
explain the effects of doppler effect in satellite communication
wave motion
1 Answer Available

Last Activity: 4 Years ago