Prism (2)

When a glass prism of apex angle $60°$  is immersed in a liquid its angle of minimum deviation is $30°$ . The critical angle of glass with respect to the liquid medium is …

•  $42°$  

•  $45°$  

•  $50\degree$  

•  $52\degree$  

The angle of minimum deviation for prism of apex angle $60\degree$  is $30\degree$ , if the velocity of light in vacuum is $3×10^8\ ms^{-1}$ , then the velocity of light in material of the prism is …

•  $2.12×10^8\ ms^{-1}$  

•  $1.12×10^8\ ms^{-1}$  

•  $4.12×10^8\ ms^{-1}$  

•  $5.12×10^8\ ms^{-1}$  

A prism of refractive index $\sqrt{2}$ has an apex angle $60\degree$ . In order that a ray suffers minimum deviation it should be incident at an angle ….

•  $45\degree$  

•  $60\degree$  

•  $90\degree$  

•  $0\degree$  

A ray of light OP passes through a right-angled prism as shown in the diagram. State the angles of incidence at the faces (AC) and (BC). Given critical angle is $42\degree$ .

• Angle of incidence at the face AC= $45\degree$  and angle of incidence at the face BC= $90\degree$ 

• Angle of incidence at the face AC= $90\degree$  and angle of incidence at the face BC= $45\degree$  

• Angle of incidence at the face AC= $45\degree$  and angle of incidence at the face BC= $0\degree$ 

• Angle of incidence at the face AC= $0\degree$  and angle of incidence at the face BC= $45\degree$  

A given ray of light suffers minimum deviation in an equilateral prism (P). Additional prism (Q) and (R) of identical shape and of the same material as (P) are now added as shown in the figure. The ray will now suffer…

• Greater deviation 

• No deviation 

• Same deviation as before 

• Total internal reflection  

A triangular prism of glass is shown in the figure. A ray incident normally to one face is totally reflected. If $θ=45°$ , the refractive index of glass is …

•  $<1.41$  

•  $=1.41$  

•  $>1.41$  

•  $=1.732$  

A prism (n=1.5) has an apex angle of $30°$ . The deviation of a monochromatic ray incident normally on its one surface will be …

•  $36°72'$  

•  $20°30'$  

•  $18°35'$  

•  $22°1'$  

In the figure ABC is the cross section of a right angled prism and BCDE is the cross section of a glass slab. The value of θ so that light incident normally on the face AB does not cross the face BC is …

• $θ≤37°$

• $θ>37°$

• $θ≤53°$

• $θ>53°$

A ray of light falls on a prism ABC (AB=BC) and travels as shown in the figure. The refractive index of the material of prism should be at least …

• $\frac{4}{3}$

• $√2$

• $\frac{3}{2}$

• $\sqrt{3}$

For a small-angled prism, angle of prism (A), the angle of minimum deviation ( $α_o$ ) varies with the refractive index of the prism (n) as shown in the graph.

• Point (P) corresponds to angle of prism (A).

• Slope of the line (PQ)=A/2.

• Slope=A

• None of the above statement is true.