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Intensity Explanation in YDSE

A ray of ligh...

Question

A ray of light of intensity I is incident on a parallel glass-slab at a point A as shown in fig. It undergoes partial reflection and refraction. At each reflection 25% of incident energy is reflected. The rays AB and A'B' undergo interference. The ratio is

[IIT 1990]

A

4 : 1

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B

8 : 1

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C

7 : 1

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D

49 : 1

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Solution

The correct option is D
49 : 1

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Q. A narrow monochromatic beam of light of intensity

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