A fish looks upward an unobstructed overcast sky- What total angle does the sky appear to subtend- -Take refractive index of water as sqrt -2-180-circ-90-circ-75-circ-60-circ-

Question

Toppr Admin · Accepted Answer

The fish can observe the sky only if refraction takes place-If TIR takes place- then image of sky cannot be observed-i-e- i-lt-ic and ic-45-x2218-So- angle subtended -x3C0-2-

A fish looks upward at an unobstructed overcast sky. What total angle does the sky appear to subtend? (Take refractive index of water as $\sqrt{2})$ .
$180^{\circ}$
$90^{\circ}$
$75^{\circ}$
$60^{\circ}$

The fish can observe the sky only if refraction takes place.
If $T I R$ takes place, then image of sky cannot be observed.
i.e., $i < i_{c}$ and $i_{c} = 45^{\circ}$
So, angle subtended $= \frac{π}{2}$ .

A fish looks upward at an unobstructed overcast sky. What total angle does the sky appear to subtend? (Take refractive index of water as √2).180∘90∘75∘60∘

The fish can observe the sky only if refraction takes place.If TIR takes place, then image of sky cannot be observed.i.e., i<ic and ic=45∘So, angle subtended =π2.

A fish looks upward at an unobstructed overcast sky. What total angle does the sky appear to subtend? (Take refractive index of water as $\sqrt{2})$ .
$180^{\circ}$
$90^{\circ}$
$75^{\circ}$
$60^{\circ}$

The fish can observe the sky only if refraction takes place.
If $T I R$ takes place, then image of sky cannot be observed.
i.e., $i < i_{c}$ and $i_{c} = 45^{\circ}$
So, angle subtended $= \frac{π}{2}$ .