How do you investigate the refractive index of glass?
3.19 practical: investigate the refractive index of glass, using a glass block
- Set up your apparatus as shown in the diagram using a rectangular block.
- Shine the light ray through the glass block.
- Use crosses to mark the path of the ray.
- Join up crosses with a ruler.
- Draw on a normal where the ray enters the glass block.
How do you find the refractive index of a glass slab using the Travel microscope?
Place the glass slab of least thickness over the mark P. Raise the microscope upwards and focus it on the image P1 of the cross-mark. Note the reading (R2) on the vertical scale as before (Step 7). Sprinkle a few particles of lycopodium powder on the surface of the slab.
What is the formula of refractive index of glass slab?
Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.
What is refractive index in microscope?
Refractive Index (Index of Refraction) is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter n or n’ in descriptive text and mathematical equations.
How refraction occurs through a glass slab?
As we can observe and see below, the refraction or bending of light rays through a glass slab takes place at the two parallel and equal and opposite surfaces. Through a glass slab, the light before coming back to the air suffers refraction two times. At the second time, the refracted ray bends away from the normal.
Which has higher refractive index water or glass?
Light moves slower in glass, so glass has a higher refractive index than water. This means that light is refracted at a greater angle.
What is refractive index of glass with respect to air?
The refractive index of glass with respect to air is 3/2 .