Total internal reflection can take place only if:
Explanation:
T.I.R. (Total Internal reflection)
i < C (condition for T.I.R.)
By Snell's Law
$\text{n}_1\sin\text{i}=\text{n}_2\sin90^{\circ}$
$\sin\text{i}=\frac{\text{n}_2}{\text{n}_1}=\sin\text{C}$
$\text{þ} \ \text{C}=\sin^{-1}$
$\because \ -1\leq\sin\text{i}\leq1$
n1 > n2 (so we can conclude that light goes from optically denser medium to rarer medium & incident angle is greater than the critical angle.)
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A capacitor is charged by using a battery which is then disconnected. A dielectric slab is then slipped between the plates, which results in
|
(a) Reduction of charge on the plates and increase of potential difference across the plates |
|
(b) Increase in the potential difference across the plate, reduction in stored energy, but no change in the charge on the plates |
|
(c) Decrease in the potential difference across the plates, reduction in the stored energy, but no change in the charge on the plates |
|
(d) None of the above |
A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular range of θ° where
|
(a) θ = 49° |
(b) θ = 90° |
(c) θ = 98° |
(d) θ = 24 |
