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1. ### thin film interference

...guess you are asking a monochromatic light is incident normally on that thin film. When we treat this problem, we need to consider the path difference(pd) of...

2. ### thin film interference

... light rays, including those reflected by thin films. Perhaps you have wondered why parallel reflected...

3. ### Thin lens(urgent)

Thin lens(urgent) 1.A plano-convex lens having a focal length of 250mm ...

4. ### thin film(destructive干涉)

... talking about destructive interference by reflection at the top and bottom of the thin film. In applying the equation: 2.n.t = (m+1/2)入 the wavelength of...

5. ### Thin lens(urgent)

Two converging lenses having focal lengths of 30 mm and 40 mm. The two lenses are placed 20 mm apart. An object is placed 40 mm in front of the first lens. Determine the position of the image by...

6. ### hollow, thin -walled sphere

1, 2) As the angle is measured in radians, A and B should have units of rad/s2 and rad/s4 resp. 3) Radius of the sphere = 23.5 cm = 0.235 m So moment of inertia = 11 x 0.2352 = 0.6075 kg/m2 And the instantaneous angular speed is d(At2...

7. ### Parallel-sided thin film

In a physics textbook, the light rays are usually drawn farther apart just for reason of clarity. In fact, the light rays are very close to each other ( a light beam can be regarded to consist of infinite number of light rays...

8. ### 物理deffraction- thin film

1. Using 2nt = (m-0.5)λ for constructive interference to occur at the reflected ray. where n is the refractive index of the film t is its thickness λ is the wavelength of the incident light m is an integer hence, λ = 2nt/(m-0.5) = 2 x 1.33 x 320/(m-0.5) The...

9. ### why film should be thin

When light travels in a film, there bound to be absorption taken place, and the light intensity would decrease. If the film is thick, light reflected at the bottom of the film would decrease in intensity substantially because the light needs to pass through twice the thickness...