Viva Voce: Refraction Through Prism | Lab Manuals for Class 10 PDF Download

Q.1. What is the relation between angle of incidence (∠i), angle of prism (∠A), angle of deviation (∠δ), and angle of emergence (∠e)?

The relation is ∠i + ∠e = ∠A + ∠δ.

Q.2. Name the process by which when a white light passes through a prism splits into its constituent seven colours.

Dispersion of light.

Q.3. How can you define an angle of prism?

The angle between two lateral faces of prism is called an angle of prism.

Q.4. Why does white light split into different colours when passes through a glass prism? 

The refractive index of different colours is different, when a white light passes through the prism, it shows different deviation and splits into its constituent colours.

Q.5. List the factors on which the angle of deviation through a prism depend.

Factors on which the angle of deviation depends are:

• Angle of prism
• Angle of incidence

Q.6. Give the range of angle of incidence to complete this experiment accurately and successfully.

The range of angle of incidence is 30° to 60°.

Q.7. What precaution must be taken for the refracting faces of glass prism while tracing the path of ray of light through it?

The faces’of the glass prism must be smooth and transparent without any air bubble or broken edge.

Q.8. Why does white light not split into different colours when it passes through a glass slab?

Since, the two faces of glass slab are parallel to each other. Hence, the refracted light rays suffer equal amount of deviation. Thus, they don’t split the white light.

Q.9.  Why does a ray of light bend towards the base when it passes through a glass prism? 

When a light ray passes through glass prism, first it travels from rarer to denser medium so, it bends towards the normal or base of prism.

Q.10. Define angle of deviation. 

The angle made by the incident ray and emergent ray is called angle of deviation.