8. (True / False ) An air wedge separates two glass plates as shown. Light of wa

Question

8. (True / False ) An air wedge separates two glass plates as shown. Light of wavelength strikes the upper plate at normal incidence. At a point where the air wedge has thickness t, you will see a bright fringe if t equals a multiple of 2 Glass Air 9. ( True/ False) If coherent electromagnetic radiation is sent through a slit of width 0.0100 mm, a wavelength of 10.6 m will result in no points in the diffraction pattern where the intensity is zero. 10. (True/False ) In using a telescope to form an image of two closely spaced, distant stars, using a filter so that only the red light from the stars enters the lens will increase the resolving power.

Explanation / Answer

8) True

The bright fringe is the intereference of light construtively. The bright fringe is formed when light interfer and the path difference is an integral multiple of wavelength.

9) False

The basic condition of diffraction is that the slit width should be more or less similar to the wavelength of light. Here wavelgnth and slit width are of similar size and there is diffraction pattern occurs

10) False

The resolving power of the telescope is inversely proportional to the wavelength. Greater the wavelegnth lesser will be the resolving power. Red has greater wavelength than other colors. So, the resolving power is low. If we use a filter which allows blue color then we could be able to see better images of the distant stars.

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