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# To Find the Refractive Index of a Liquid by Using a Convex Lens and Plane Mirror - Physics Practical Class 12 Viva Questions with Answers

1. What happens when the light ray travels from a rarer medium to a denser medium?

Answer: When the light ray travels from a rarer medium to a denser medium, it bends at the interface of the two mediums and again travels in a straight line.

1. What is refraction?

Answer: Refraction of light is a phenomenon where the light ray travelling from a lighter medium to a denser medium bends at the interface of two mediums.

1. What is the formula for finding the refractive index with respect to the medium and air?

$$\begin{array}{l}n=\frac{real thickness of the slab}{apparent thickness of the slab}\end{array}$$
.

1. State true or false: The refractive index is dimensionless.

Answer: True. The refractive index is a dimensionless quantity.

1. What is the speed of light in a vacuum?

Answer: The speed of light in a vacuum is 3 * 10^8 m/s.

1. Which is the phenomenon that is responsible for the sunrise and sunset?

Answer: Atmospheric refraction is the phenomenon that causes the sunrise and sunset.

1. Define absolute refractive index.

Answer: The ratio of the velocity of the light in the air to its velocity in a medium gives the absolute refractive index of the medium.

1. What is a convex lens?

Answer: A convex lens is thicker at the centre and thinner at the edges. This lens has the ability to converge a straight beam of light.

1. What is the refractive index of the air?

Answer: The refractive index of the air is 1.0003.

1. What is the refractive index of glass?

Answer: The refractive index of glass is 1.52.

1. Does the refractive index vary with wavelength?

Answer: Yes. The refractive index varies with wavelength.

1. What is the formula to find the refractive index of medium 2 with respect to 1?

Answer: The formula is: n_{21}=\frac{Speed of light in medium 1}{Speed of light in medium 2}.

1. What is a prism?

Answer: A prism is a transparent material surrounded by three rectangular surfaces forming a triangle.

1. Why is the speed of light in water faster than the speed of light through glass?

Answer: The speed of light in water is faster than the speed of light through glass because the refractive index of water is lesser than that of glass.

1. What is the angle of the prism?

Answer: Refracting angle of the prism or the angle of the prism is defined as the angle formed between the two refracting surfaces of the prism.

1. What is the formula for finding the absolute refractive index of the medium?

Answer: The absolute refractive index of the medium is given by the formula:

$$\begin{array}{l}n_{m}=\frac{c}{v}\end{array}$$
.

1. Give the Snell’s law formula.

Answer: Snell’s law is given by the formula:

$$\begin{array}{l}\frac{sin i}{sin r}=constant=\mu \end{array}$$
.

1. What is the unit of the refractive index?

Answer: The refractive index does not have a unit. It is dimensionless.

1. What is optics?

Answer: Optics is the branch of physics that deals with the behaviour and properties of light along with its interactions with matter.

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