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I need help with those problems. please 3. A light ray passes from air {n=1.00) into glass (n=1.21). The refracted ray has an angle of

I need help with those problems. please

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3. A light ray passes from air {n=1.00) into glass (n=1.21). The refracted ray has an angle of 12 from the normal. What is the angle of the incident ray? 4. A concave mirror has a focal length of 22 cm. When an object is placed in front of the mirror. it forms an inverted. real image with a height of 9 cm. If the image is 13 cm from the mirror, what is the height and distance of the object

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