Lab Activity: To Determine Refractive Index of Glass Slab Using Travelling Microscope

Cotyledons are also called-

The layer of the lycopodium powder on the upper surface of the slab is thick. What is the possible change in the readings when finding the refractive index of the glass material using a travelling microscope?

Which one of the following steps is wrong when finding the refractive index of glass using a travelling microscope?

Which one of the following is the purpose of using the lycopodium powder in the experiment to find the refractive index of glass?

Three observations were taken to find the refractive index of the material of glass slab. The reading for the mark on the paper $\left(R_1\right)$, The reading on the mark of the paper with slab $\left(R_2\right)$ , and the reading for lycopodium powder $\left(R_3\right)$. Which of the following will be the correct formula for finding the refractive index?

There are $20$ small divisions within $1 \mathrm{cm}$ on the main scale and $50$ divisions on the vernier scale coincide with $49$ divisions on the main scale. While taking the readings a student found the $1 \mathrm{cm}$ mark of the main scale just before the zero of the vernier scale and ${24}^{th}$ division of the vernier scale coinciding with a division on the scale. Which one of the following is the correct reading to be noted in the observation table?

A student took the following three readings with a travelling microscope to find the refractive index of the material of the glass slab: (R₁)$=0.630 \mathrm{cm}$, (R₂) $=1.859 \mathrm{cm}$ , and (R₃) $=0.035 \mathrm{cm}$ but forgot to put them in the appropriate columns of the observation table. Which one of the following is the correct statement about the readings taken by him?

Which of the following is a common observation for calculating the real thickness and apparent thickness of a glass slab using a travelling microscope?