Explanation:
The focal length of a lens is inversely proportional to the refractive index of the lens and the refractive index of the lens is inversely proportional to the square of wavelength. Therefore, the focal length is directly dependent on wavelength; it increases when the wavelength is increased.
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When a thin transparent plate of thickness t and refractive index m is placed in the path of one of the two interfering waves of light, then the path difference changes by
|
(a) (m + 1)t |
(b) (m – 1)t |
(c) |
(d) |
The output of OR gate is 1
|
(a) If both inputs are zero |
(b) If either or both inputs are 1 |
|
(c) Only if both input are 1 |
(d) If either input is zero |
