Prism (1)

A ray of light is incident on an equilateral prism in such a way that the angle of incidence is equal to the angle of emergence, and each is equal to $\frac{3}{4}$  of the prism angle. The angle of deviation for the ray of light is …  

•  $45°$  

•  $30°$  

•  $39°$  

•  $20°$  

A ray of light is incident normally on one refracting surface of an equilateral prism. If the refractive index of the material of the prism is 1.5, then …

• the emergent ray is deviated by $30\degree$ .
  

• the emergent ray is deviated by $60\degree$ .

• the emergent ray just graces the second reflecting surface.

• the ray undergoes total internal reflection at second refracting surface.

The speed of light in air and glass is $3×10^8m⁄s$ , and $2×10^8m⁄s$  respectively. A beam of light falls on a glass at an angle of $30\degree$ with surface. The angle of refraction in glass is …

•  $19°28'$  

•  $35°16'$  

•  $15°26'$  

•  $30°16'$  

A ray of light is normally incident on one face of an equilateral glass prism. What will be the angle of incidence at the second face of the prism?

• $0°$

• $30°$

• $60°$

• $90°$

A prism splits a beam of white light into its constituent colours. This is so because .......... of different colours is different.

• velocity

• energy

• amplitude

• none of these

A prism of refractive index $\sqrt{2}$  has an apex angle  $60\degree$ .What is the angle of minimum deviation?

•  $45\degree$  

•  $90\degree$  

•  $60\degree$  

•  $30\degree$  

Two equilateral prisms are arranged as shown in figure such that a ray of white light is incident at point (X) The ray of light which emerges out of the prism (Q) …

• Will show all the colours of spectrum.

• Will be white light.

• Will be orange in colour.

• Will be dull white in colour.

A ray of monochromatic light is incident on one refracting face of a prism of angle  $75°$ . If passes through the prism and is incident on the other face at the critical angle. If refractive index of the material of the prism is $\sqrt{2}$ ​, the angle of incidence on the first face of the prism is …

•  $30\degree$ 

•  $45\degree$ 

•  $60\degree$ 

•  $0\degree$ 

Three prisms 1, 2 and 3 have $A=6\degree$  , but refractive indices are 1.4, 1.5, 1.6 and their angles of deviation are $α_1,α_2,α_3$  ​ respectively. Then …

•  $α_3>α_2>α_1$ 

•  $α_1>α_2>α_3$ 

•  $α_2>α_1>α_3$ 

•  $α_1=α_2=α_3$ 

The refractive index of an equilateral prism is $\sqrt{3}$ . What is the angle of minimum deviation?

•  $45°$  

•  $60°$  

•  $37\degree$  

•  $72\degree$