My professor gave me the answers for numbers 92 and 93 (answers below) but I nee

Question

My professor gave me the answers for numbers 92 and 93 (answers below) but I need help with this question:

#94. If the slab (without the oil) is submerged in a fluid with an index of refraction of 1.5, what will be the effect?

(n1+n2) According to this result, typical optical glass (with an index of refraction of 1.5) should reflect about 4% (0.04) of the light normally incident from the surrounding air, which is in fact the case. If a light beam strikes a 10 cm thick slab of glass (which is immersed in air) at an angle of 30 degree from the normal to the surface. what will be its angle to the normal when it leaves the back side of the slab? Assume that the slab has parallel sides and an index of refraction of 1.5. If a layer of oil, with an index of refraction of 1.8, is placed on the top of the glass, what will be the new angle at which the light beam leaves the glass? If the entire slab (without the oil) is submerged in a fluid with an index of refraction of 1.5, what will be the effect?

Explanation / Answer

ANSWER:C.The slab will be very difficult to see

REASON:If a transparent object is surrounded by another material that has the same OR NEARLY SO index ofrefraction, then the speed of light will not change as it enters the object.THUS OBJECTS WILL SEEM AS IF THEY ARE THESAME OR CAUSE AN ILLUSION THAT GLASS DISAPPEARED

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