Question

4. Assertion: Higher the refractive index of the prism material, lower is the angle of deviation.

Reason: The angle of deviation is directly proportional to the angle of the prism.

Answer 1

Answer:

(A) both Assertion and Reason are correct and Reason is correct Explanation

of Assertion

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Answer 2

Answer:

Concept:

Refraction is one of the optical phenomena that shows that light is a wave, along with reflection, interference, and diffraction, among others. Due to the difference in the speed of light at various media, it manifests as the "bending" of light rays as they pass through one medium and enter another.

Explanation:

• Refractive index, commonly known as the index of refraction, is a measurement of how much a light beam bends when it passes through one medium and into another.
• The refractive index n is defined as the ratio of the sine of the angle of incidence to the sine of the angle of refraction, i.e., $n = sin i/ sin r$, if $i$ is the angle of incidence of a ray in vacuum (angle between the incoming ray and the perpendicular to the surface of a medium, known as the normal) and $r$ is the angle of refraction (angle between the ray in the medium .
• Additionally, the refractive index is determined by dividing the velocity of a specific wavelength of light in vacuum by its velocity.
• The angle of deviation is the difference between the angle of incidence and the angle of refraction of a light ray as it passes through the surface of two media with differing refractive indices.

Hence, both the given statements(Assertion and reason) are true.

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