You switch from a 60x oil immersion objective with an NA of 1.40 to a 40x air immersion objective with an NA of 0.5. In this problem you can take the index of refraction of oil to be 1.51. Part (a) What is the acceptance angle (in degrees) for the oil immersion objective? α1 = Part (b) What is the acceptance angle (in degrees) for the air immersion objective?

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