Class 10 Science | Laws of refraction of light

Activity 10.3

Materials

Method

Draw four quadrants on the plain paper as you used to draw on graph paper.
Draw the degree scales in the first and the fourth quadrants using a pencil and a protractor.
Place the semicircular glass slab on the paper taking the x-axis as its base, so that the origin lies at the mid-point of its base.
Using the ray box or laser beam pointer, pass the light beam through the base plane of the glass slab at different angles of incidence.
Each time, measure the angle of incidence and the angle of refraction and fill in their values in the table.
Do the necessary calculations and draw an appropriate conclusion.

Ratio of speed of light in air to that in glass	Angle of incidence (∠i)	Angle of refraction (r) (∠r)	sin i	sin r	sin i ÷ sin r	Result
speed of light in air ÷ speed of light in medium = (3 × 10⁸) ÷ (2 × 10⁸) = 1.5	15	10			1.49	μ = 1.49

Discussion

Conclusion: what do the values of sin i ÷ sin r for the different angles of incidence show?
What happens to the light beam when it falls normally on the glass slab?

🔐

That's a peek at activity 1 of 1 - sign in for all of them, full length.