Home
Class 12
PHYSICS
A glass prism (mu = 1.5) is dipped in w...

A glass prism `(mu = 1.5)` is dipped in water `(mu = 4//3)` as shown in figure. A light ray is incident normally on the surface AB . It reaches the surface BC after totally reflected, if

A

sin`theta ge 8//9`

B

`2//3 lt sin theta lt 8//9`

C

`sin theta le 2//3`

D

it is not possible

Text Solution

Verified by Experts

The correct Answer is:
A
For TIR at face AC
`theta ge i_(c ) `

`rArr " " sin theta ge sin i_(c )`
`rArr " " sin theta ge (1)/(n_(gw))`
`rArr " " sin theta ge (n_(w))/(n_(g)) rArr sin theta ge (8)/(9)` .
Promotional Banner

Similar Questions

Explore conceptually related problems

A glass prism is immeresed in water as shown in the figure. When a beam of light incident is incident normally on the face ab, it is internally reflected at the face ad. If the refractive index of glass is 1.5 and that of water is 4//3 , then

A glass prism of refractive index 1.5 is immersed in water (refractive index 4/3). A light beam incident normally on the face AB is totally reflected to reach on the face BC if.

A glass prism of refractive index 1.5 is immersed in water (refractive index 4/3). A light beam incident normally on the face AB is totally reflected to reach the face BC , Fig. if : .

A glass prism of refractive index 1.5 is immersed in water (refractive index 4//3 ) . A light beam normally on the face AB is totally reflected to reach on the face BC if

A glass prims ABC (refractive index 1.5) , immersed in water (refrective index 4/3 ). A ray of light is incident normally one face AB. If it is totally reflected at the face AC, then

A ray of light is incident on the surface of water. For what angle, the ray will undergo total internal reflection ?

Figure shows a glass (mu_(g) = 1.5) vessel, partly filled with water ( mu_(w) = (4)/(3)) . A ray of light is incident normally on the water surface and passes straight through. The vessel is tilted slowly till angle theta such that the light ray is emergent grazing the lower surface of the glass. Find theta .