cm away. The first bright fringes are 1.9 cm from the center of the pattern. How

Question

cm away. The first bright fringes are 1.9 cm from the center of the pattern. How many lines per mm does this grating have? A. 20 B. 40 C. 80 D. 200 24. | Light passes through a 10-mu m-wide slit and is viewed on a screen 1 m behind the slit. If the width of the slit is narrowed, the band of light on the screen will A. Become narrower. B. Become wider. C. Stay about the same. 25. | | Blue light of wavelength 450 nm passes through a 0.20 ? mm - wide slit and illuminates a screen 1.2 m away. How wide is the central maximum of the diffraction pattern? A. 1.2 mm B. 2.0 mm C. 2.7 mm D. 5.4 mm 6. | | A green laser beam of wavelength 540 nm passes through pinhole and illuminates a dartboard 3.0 m past the pinhole. Th first minimum in the intensity coincides with the ring surroun

Explanation / Answer

25. B

26. C

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