The angle of minimum deviation for an equilateral glass prism is . The refractive index of the prism is
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Official Solution
Correct Option: (2)
Step 1: Formula
Refractive index . Step 2: Values
Equilateral prism means and . Step 3: Calculation
$ $ Final Answer: (B)
02
PYQ 2010
medium
physicsID: met-2010
A beam of light is incident at to a plane surface. The reflected and refracted rays are perpendicular to each other then refractive index of the surface is
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None of these
Official Solution
Correct Option: (1)
Step 1: Concept
When reflected and refracted rays are perpendicular, the angle of incidence is the Brewster's angle ( ). Step 2: Formula
According to Brewster's Law, . Step 3: Calculation
. Final Answer: (A)
03
PYQ 2015
medium
physicsID: met-2015
A rectangular glass slab ABCD of refractive index is immersed in water of refractive index . A ray of light is incident at the surface AB of the slab as shown. The maximum value of the angle of incidence such that the ray comes out only from the another surface CD is given by
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Official Solution
Correct Option: (1)
Step 1: Understanding the Concept:
For the ray to exit only from CD, it must undergo total internal reflection at the AD face. The critical angle at the AD face satisfies . Step 2: Detailed Explanation:
From geometry, , so . Applying Snell's law at face AB:
Step 3: Final Answer:
