(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

How is the refractive index of a medium related to the speed of light in it? 

A monochromatic ray of light passes from air to glass. The wavelength of light in air is λ, the speed of light in air is c and in glass is V. If the absolute refractive index of glass is 1.5, write down

1. the relationship between c and V,
2. the wavelength of light in glass.

For which colour of white light, is the refractive index of a transparent medium the most?

A ray of light strikes the surface of a rectangular glass block such that the angle of incidence in
air is  0°.
In each case, draw diagram to show the path taken by the ray as it passes through the glass block and emerges from it. 

In the adjacent diagram, AO is a ray of light incident on a rectangular glass slab.

1. Complete the path of the ray till it emerges out of the slab.
2. In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r?
3. Mark angles of emergence by the letter e. How are the angles i and e related?
4. Which two rays are parallel to each other? Name them.
5. Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. When is the glass piece not seen?

When a lighted candle is held in front of a thick plane glass mirror, several images can be seen, but the second image is the brightest, give reason.

When light travels from a rarer to a denser medium, its speed ______.

When a ray of light from air enters a denser medium, it ______.

The highest refractive index is of ______.

A ray of light of wavelength 6600 Å suffer refraction from air to glass. Taking \[\ce{_a\mu_g = \frac{3}{2}}\], find the wavelength of light in glass.

With the help of diagram of the principal section of a prism, indicate its refracting surfaces, refracting edge and base. 

How does the angle of deviation produced by a prism change with increase in the angle of incidence. Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.

How does the angle of minimum deviation produces by a prism change with increase in :

the wavelength of incident light 

How does the angle of minimum deviation produces by a prism change with increase in : 

the refracting angle of prism? 

Answer the following questions in your own words.

What is meant by scattering of light?

How does the intensity of scattered light depend on the wavelength of incident light? State conditions when this dependence holds.

The sky at noon appears white. Give reason.

What is meant by the natural frequency of vibration of a body?

What are non-ohmic reistors? Give one example and draw a graph to show its current-voltage relationship.