1 the speed of light in a certain substance is 88 of its, Ask an Expert

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1. The speed of light in a certain substance is 88% of its value in water. What is the index of refraction of that substance?

2. In a slide or movie projector, the film acts as the object whose image is projected on to the screen. A 105 mm focal length lens is to project an image on a screen 6.5 m away.

A. Decide how far from the lens the slide must be

B. Of the slide is 36 mm wide, how wide will the picture be on the screen?

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Category:- Physics
Reference No.:- M91222221

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