A tungsten-halogen bulb emits a continuous spectrum of ultraviolet, visible, and

Question

A tungsten-halogen bulb emits a continuous spectrum of ultraviolet, visible, and infrared light in the wavelength range 360nm to 2000nm.Assume that the light from a tungsten-halogen bulb is incident on a diffraction grating with slit spacing d and that the first-order brightness maximum for the wavelength of 1200nm occurs at angle .

A) What other wavelength within the spectrum of incident light will produce a second-order brightness maximum at this same angle ?

B)What other wavelength within the spectrum of incident light will produce a third-order brightness maximum at this same angle ?

Explanation / Answer

A) for the same angle theta the second order brightness maximum is 1200nm/2 = 600 nm.

B) for the same angle theta the third order brightness maximum is 1200/3 = 400 nm.

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