Question

(a) With reference to an appropriate formula or otherwise, explain why light bends noticeably when passing through a small gap (such as a diffraction grating), but does not bend noticeably when passing through a large gap (such as a window). (b) Coherent light is diffracted by a single slit which is 10 µm wide. The central maximum of the diffracted light has a width of 1.6 cm when it falls on a screen 0.2 m behind the slit. Determine the wavelength of the incident light. (c) Light of wavelength 690 nm passes through two slits which are separated by 0.6 mm. The screen is 1.5 m away. A second source of unknown wavelength produces light and dark fringes which are 1.13 mm closer together than the 690 nm light. What is the wavelength of the unknown light?

          (a) With reference to an appropriate formula or otherwise, explain why light bends noticeably when passing through a small gap (such as a diffraction grating), but does not bend noticeably when passing through a large gap (such as a window).
(b) Coherent light is diffracted by a single slit which is 10 µm wide. The central maximum of the diffracted light has a width of 1.6 cm when it falls on a screen 0.2 m behind the slit. Determine the wavelength of the incident light.
(c) Light of wavelength 690 nm passes through two slits which are separated by 0.6 mm. The screen is 1.5 m away. A second source of unknown wavelength produces light and dark fringes which are 1.13 mm closer together than the 690 nm light. What is the wavelength of the unknown light?

$(a) With reference to an appropriate formula or otherwise, explain why light bends noticeably when passing through a small gap (such as a diffraction grating), but does not bend noticeably when passing through a large gap (such as a window). (b) Coherent light is diffracted by a single slit which is 10 µm wide. The central maximum of the diffracted light has a width of 1.6 cm when it falls on a screen 0.2 m behind the slit. Determine the wavelength of the incident light. (c) Light of wavelength 690 nm passes through two slits which are separated by 0.6 mm. The screen is 1.5 m away. A second source of unknown wavelength produces light and dark fringes which are 1.13 mm closer together than the 690 nm light. What is the wavelength of the unknown light?$

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