A monochromatic ray of light travels thr...

A monochromatic ray of light travels through an equilateral prism such that angle of deviation is `30^(@)`. If the difference between angles of incidence and emergence is `10^(@)`, then I and r respectively are

`45^@, 55^@`

50^@, 40^@`

`35^@, 45^@`

`30^@, 40^@`

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