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Answers
Answer:
Snell law = sin i/ sin r
refractive index = speed of light in vacuum/speed of light in the medium
this Ans is of 3Q.☝️ this ans ☝️ is Q.6
Q.1Ans) Physics Light Reflection Refraction. Refractive Index. Refractive Index. The extent of the change in direction that takes place in a given pair of media is expressed in terms of the refractive index. It turns out that light propagates with different speeds in different media.
Q.2Ans)In geometry, the center of curvature of a curve is found at a point that is at a distance from the curve equal to the radius of curvature lying on the normal vector. It is the point at infinity if the curvature is zero. The osculating circle to the curve is centered at the centre of curvature
Q3.ans)Answer:− B
Total internal reflection is a phenomenon which occurs when a propagating wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface. If the refractive index is lower on the other side of the boundary and the incident angle is greater than the critical angle, the wave cannot pass through and is entirely reflected. The critical angle is the angle of incidence above which the total internal reflection occurs.
Q4Ans) Explanation: A lemon in a glass of water appear bigger than its actual size is due to refraction of light". Reason: Light is refracted as it passes from water into air. Here, Tumbler with water acts as convex lens which curves outward in the middle and can focus light rays to magnify object.
Q5.ans) Rays of light parallel to the principal axis of a concave mirror will appear to converge on a point in front of the mirror somewhere between the mirror's pole and its center of curvature. That makes this a converging mirror and the point where the rays converge is called the focal point or focus
Q.6Ans)Angle of Deviation is defined as the angle between the incident and the emergent ray.
As the light enters the first refracting surface of the prism it gets refracted and is incident at the second refracting surface and emerges out at an angle of emergence from the prism. The angle of deviation of is the angle of diversion which is produced in the path of the incident light ray striking at the prism
i)Ray diagram for a ray travelling parallel to the principal axis strikes convex surface and refracts from rarer to denser medium:
A normal is a line drawn perpendicular to a refracting or reflecting surface.
The point of concurrence of all normals drawn to a surface is called center of curvature.
Principal axis is the imaginary line which passes through pole and center of curvature of the curved surface.
When a ray parallel to principal axis travelling from rarer to denser medium strikes convex surface, it gets refracted and bends towards normal
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