SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Light traveling from air to some unknown material makes an angle of 40 degrees to the normal and refracts at an angle of 26 degrees, what is the index of refraction of the new material?
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1.47
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0.68
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1.2
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1.67
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Explanation:
Detailed explanation-1: -Therefore, the angle of refraction is approximately 19.1°.
Detailed explanation-2: -Solution: The angle of emergence will be 40o. For a rectangular glass slab, the angle of incidence (i) is always equal to the angle of emergence. Hence, the angle of emergence is 40o.
Detailed explanation-3: -In this case, the angle of incidence is 40° and the angle of refraction is 30°. In order to calculate the angle of deviation, we can use the formula = i-r, where is the angle of deviation, i is the angle of incidence and r is the angle of refraction. Using this formula, the angle of deviation is 10° (40°-30°).
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