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A concave mirror produces a virtual image that is seven times as tall as the object.
(a) If the object is 23 cm in front of the mirror, what is the image distance?
cm
(b) What is the focal length of this mirror?
Light of wavelength 619 nm is incident normally on a diffraction grating. Two adjacent maxima occur at angles given by sin ? = 0.20 and sin ? = 0.32. The fourth-order maxima are missing, What is the separation between adjacent slits
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