Question

Can u answer questions 1&2 with clear writing please

We will be looking at the movement of light along straight lines using the optics bench. You've most likely also used a mirror to see yourself or other things by way of their reflected image. In fact, everything you see is based on the light that bounces off or travels through the material between you and the object you're looking at. This is why it's harder to see detail or distance while looking through water than you would through air. This alteration of light through a material is called refraction. With a triangular shaped prism it is the refraction of the light traveling through the material that separates out the wavelengths that give you the different colors. While we won't be using a set up to split the spectra, we will be altering the path of light rays as they travel through a medium. When dealing with refraction there is one main equation that needs to be used. nisin(e1) n2sin2) This is known as Snell's Law, and is used to calculate the interaction of light as it moves from one material to another. In this equation n1 stands for the index of refraction for the first material (think of this as the light equivalent of the conductivity of the material), n2 stands for the second materials index of refraction (usually the material the light is going into), while θ1, and θ2 are the angles of the light beam compared to a perpendicular line coming from the surface of the material. PreLab: Complete the Safety Exam that is available on the lower left hand comer of WTClass. Bring a printed copy of the report that shows your name and score. the score is 100% Make sure Procedure. The instructor will have the light bench set up so the light source will send a single ray of light out of the slit plate and towards a cylindrical lens mounted on a ray table. The flat surface of the cylindrical lens should be along the line marked Component on the ray table. This will give you your normal lines (perpendicular to the surface) as the lines marked radia With the light source on, and without disturbing the lens, rotate the ray table and observe the alterations of the light ray 1. Does the ray bend when it passes into the lens perpendicular to the flat surface of the lens? 2. Does the ray bend when it passes out of the lens perpendicular to the curved surface of the lens?

Answer 1

1. when light enters the lens perpendicular to the flat surface of the lens, the angle of incidence with the normal to the surface is 0 deg, and from snells law this means the angle of refraciotn is also 0 deg and hence the incoming light ray falling on the plane surface of the lens does notundergo bending

2. when thelight ray passes out of the curved surface of the lens, but perpendicular to the curved surface of the lens as well, at the point of intersection of the light ray and the interface, then again the angle of incidence is 0 deg a wrt the normal and hence from snell's law the angle of refraction is also 0 deg and hence the light ray suffers no bending while refracting out of hte curved surface of the glass lens when the light ray is perpendicular to the interface