Question
- What is total internal reflection? Under what conditions does it occur?
- Find a relation between critical angle and refractive index.
- Name one phenomenon which is based on total internal reflection.
✓
Answer
- When a ray of light travels from a denser medium into a rarer medium at an angle greater than the critical angle, it reflects back into the denser medium. This phenomenon is called total internal reflection. Conditions for total internal reflection.
- Light should travel from denser medium to rarer medium.
- Angle of incidence should be greater than critical angle.
- $\frac{1}{\mu} = \frac{\sin\text{ i}}{\sin\text{ r}} , $ for total internal reflection to occur $i \geq i _{c}$ at critical angle, angle of refraction$\text{?}=90^{o}$, hence, $\frac{1}{\mu} = \frac{\sin\text{i}_{c}}{\sin90^{o}}$
- Mirage/sparkling of diamond/ optical fiber/totally reflecting Prism/shinning of air bubbles in water.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
When $1.0 \times 10^{12}$ electrons are transferred from one conductor to another, a potential difference of $10V$ appears between the conductors. Calculate the capacitance of the two$-$conductor system.
→You are given two circuits as shown in Fig. 14.46, which consist of NAND gates. Identify the logic operation carried out by the two circuits.
When we stir a liquid vigorously, it becomes warm. Is it a reversible process?
The nucleus $^{23}_{10}\text{Ne}$ decays by $\beta$ emission. Write down the $\beta-$decay equation and determine the maximum kinetic energy of the electrons emitted. Given that:
$\text{m}(^{23}_{10}\text{Ne})=22.994466\text{ u}.$
$\text{m}(^{23}_{10}\text{Na})=22.089770\text{ u}.$
→$\text{m}(^{23}_{10}\text{Ne})=22.994466\text{ u}.$
$\text{m}(^{23}_{10}\text{Na})=22.089770\text{ u}.$
An electric bulb, when connected across a power supply of 220V, consumes a power of 60W. If the supply drops to 180V, what will be the power consumed? If the supply is suddenly increased to 240V, what will be the power consumed?
How electromagnetic waves are produced? What is the source of the energy accompanied by any propagating electromagnetic wave?
(i) In far switches of household electrical appliances
(ii) In medical diagnosis
(i) In far switches of household electrical appliances
(ii) In medical diagnosis
A bulb rated 60W at 220V is connected across a household supply of alternating voltage of 220V. Calculate the maximum instantaneous current through the filament.
The maximum tension in the string of an oscillating pendulum is double of the minimum tension. Find the angular amplitude.
In a plot of photoelectric current versus anode potential, how does?
- The saturation current vary with anode potential for incident radiations of different frequencies but same intensity?
- The stopping potential vary for incident radiations of different intensities but same frequency?
- Photoelectric current vary for different intensities but same frequency of incident radiations?
Explain two main important points for astronomical telescope.