An IGCSE student is using optics pins to trace the path of light through a rectangular glass block. The student places two pins, $P_1\,$ and $P_2$ , on the incident ray. The student then looks through the opposite side of the block to place two pins, $P_3\,$ and $P_4$ , in line with the images of $P_1\,$ and $P_2$ .

State why the student should place the pins $P_1\,$ and $P_2\,$ as far apart as possible, and state the minimum recommended distance between them.

The pins might not be pushed into the paper perfectly vertically. Explain how the student can align the pins $P_3\,$ and $P_4\,$ with the images of $P_1\,$ and $P_2\,$ as accurately as possible.

In a trial, the student measures an angle of incidence at the first boundary of $35^\circ$ and an angle of refraction inside the block of $22^\circ$ .

Calculate the refractive index $n\,$ of the glass block to two decimal places.

State the unit of the refractive index, if any.

State why the student should place the pins $P_1\,$ and $P_2\,$ as far apart as possible, and state the minimum recommended distance between them.

The pins might not be pushed into the paper perfectly vertically. Explain how the student can align the pins $P_3\,$ and $P_4\,$ with the images of $P_1\,$ and $P_2\,$ as accurately as possible.

In a trial, the student measures an angle of incidence at the first boundary of $35^\circ$ and an angle of refraction inside the block of $22^\circ$ .

Calculate the refractive index $n\,$ of the glass block to two decimal places.

State the unit of the refractive index, if any.

3.2.2 Refraction of light

Question 29

Markscheme

3.2.2 Refraction of light

Question 29

Markscheme

3.2.2 Refraction of light

Question 29

3.2.2 Refraction of light Questions

3.2.2 Refraction of light

Question 29

3.2.2 Refraction of light Questions