PhysicsClass 10en

💡 Light: Reflection and Refraction

Master the fundamental principles of light behaviour when it interacts with surfaces and changes medium. **What you'll learn:** - Apply laws of reflection and refraction to solve real-world optical problems - Calculate angles of incidence, refraction and critical angles using Snell's law - Distinguish between total internal reflection and partial reflection - Understand refractive index and how it affects light propagation - Analyse optical phenomena in mirrors, lenses and transparent media

10 questions · play in your browser

No signup required — try it for free.

Questions in this quiz

Answers hidden — play to find out.

Question 1
The angle of incidence is always equal to the angle of reflection, measured from the normal to the reflecting surface.
Question 2
When light travels from a denser medium (like glass) to a less dense medium (like air), which of the following occurs?
Question 3
The refractive index of a medium is defined as the ratio of the speed of light in vacuum to the speed of light in that medium: $n = \frac{c}{v}$ . If the refractive index of glass is $1.5$ , the speed of light in glass is $\frac{c}{___}$ .
Question 4
Total internal reflection can only occur when light travels from a less dense medium to a denser medium.
Question 5
A light ray hits a plane mirror at an angle of incidence of $30°$ . What is the angle between the incident ray and the reflected ray?
Question 6
The critical angle $\theta_c$ for total internal reflection is given by $\sin\theta_c = \frac{n_2}{n_1}$ , where $n_1$ is the refractive index of the denser medium and $n_2$ is the refractive index of the less dense medium. For a glass-air interface with $n_{\text{glass}} = 1.5$ and $n_{\text{air}} = 1$ , the critical angle is approximately $___$ degrees.
Question 7
A light ray enters water from air at an angle of incidence of $45°$ . The refractive index of water is $1.33$ . Using Snell's law, what is the approximate angle of refraction?
Question 8
When light passes through a parallel-sided glass slab, the emergent ray is parallel to the incident ray but laterally displaced.
Question 9
Arrange these steps in the correct order for finding the critical angle of a glass-air interface.
Question 10
A prism has a refractive index of $1.6$ and is immersed in a liquid with refractive index $1.3$ . The relative refractive index of the prism with respect to the liquid is: