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Refraction of Light at Plane Surfaces
Name one factor that affects the lateral displacement of light as it passes through a rectangular glass slab.
The factors that affect the lateral displacement of a light as it passes through a rectangular glass slab are:
1. The thickness of the glass slab: The lateral displacement increases with the increase in the thickness of the glass slab.
2. The angle of incidence: It increases with the increase in the angle of incidence.
3. The refractive index of glass: The wavelength of light used. (It is more for violet light than for red light).
The speed of light in glass is 2 × 105 km/s. What is the refractive index of the glass?
Refractive index of glass =
Jatin puts a pencil into a glass container having water and is surprised to see the pencil in a different state.
i) What change is observed in the appearance of the pencil?
ii) Name the phenomenon responsible for the change.
iii) Draw a ray diagram showing how the eyes see the pencil.
i) The pencil under water appears to be shortened and raised up.
ii) Refraction of light is the phenomenon responsible for this change.
iii) 
A ray of light is moving from a rarer medium to a denser medium and strikes a plane mirror placed at 90o to the direction of the ray as shown in the diagram.
i) Copy the diagram and mark arrows to show the path of the ray of light after it is reflected from the mirror.
ii) Name the principle you have used to mark the arrow to show the direction of the ray.
i) The direction of the ray of light is as shown below:
ii) The principle of reversibility of light.
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Mock Test Series
Mock Test Series