1)if angle of incidence is 56 and it is decreased by 15 dagree then draw the path of a ray by drawing a diagram by using exact value of angle of incidence and angle of refraction.as refractive index of glass is 1.5.
2)name the phenomenon of light which u observe above.
In your question, it is not clear which angle is being decreased by 15 degrees. If they want you to calculate the angle of refraction for 56-15 = 41 degree incidence, then use Snell's law for the new angle of refraction.
We cannot draw figures for you. You will have to do that yourself.
To draw the path of a ray, we need to use Snell's Law, which relates the angle of incidence and the angle of refraction at the interface of two media. Snell's Law can be expressed as:
n1 * sin(theta1) = n2 * sin(theta2)
Where:
- n1 is the refractive index of the first medium (in this case, air, which is approximately 1),
- theta1 is the angle of incidence,
- n2 is the refractive index of the second medium (in this case, glass, which is given as 1.5), and
- theta2 is the angle of refraction.
Let's solve the equation step by step:
Given:
- Angle of incidence (theta1) = 56 degrees
- Decrease in angle of incidence = 15 degrees
- Refractive index of glass (n2) = 1.5
Step 1: Find the angle of refraction (theta2) with the original angle of incidence (56 degrees).
Using Snell's Law:
n1 * sin(theta1) = n2 * sin(theta2)
1 * sin(56°) = 1.5 * sin(theta2)
sin(theta2) = (1 * sin(56°)) / 1.5
sin(theta2) = 0.448
theta2 = sin^(-1)(0.448)
theta2 ≈ 27.6°
Step 2: Find the angle of incidence (theta1) with the decreased angle (41 degrees).
To find the new angle of incidence, we subtract the decrease from the original angle of incidence:
theta1 = 56° - 15°
theta1 = 41°
Now, we have both the original angle of refraction (27.6 degrees) and the new angle of incidence (41 degrees).
To draw the path of the ray, start by drawing a straight line representing the interface between air and glass. Draw a perpendicular line from the interface, indicating the surface normal. From the point of incidence on the interface, draw a ray at an angle of 41 degrees with the normal line. Then, using a protractor, measure the angle of refraction (27.6 degrees) from the normal line and draw the refracted ray.
The phenomenon of light observed above is refraction, which is the bending of light as it passes from one medium to another with a different refractive index.