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Q.))a point source of light is from a screen and is kept at d focus of a concave mirror which reflects light on d screen. the focal length of d mirror is 20 cm. The ratio of average intensities of the illumination on d screen when d mirror is present and when d mirror is removed is....





do reply asap plzzzz........

6 years ago


Answers : (1)


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6 years ago

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