Required Practical: Light

Question 1

What is the objective of the required practical activity concerning light?

Answer 1

The objective is to investigate the refraction of light by different substances.

Question 2

What materials are needed for the required practical activity on light refraction?

Answer 2

The materials needed include:
a ray box
a suitable power supply
collimating slit and lens
rectangular transparent blocks (e.g., glass and Perspex)
a 30 cm ruler
protractor
sheets of plain A3 paper.

Question 3

How can students determine the refractive index of different materials in the light refraction experiment?

Answer 3

Students can plot a graph of the sine of the angle of incidence against the sine of the angle of refraction, where the gradient of the line represents the refractive index.

Question 4

What precautions should be taken during the light refraction experiment to ensure safety?

Answer 4

Precautions include conducting risk assessment and management, switching off the ray box when not in use, and carrying out the experiment in reduced lighting to minimize the risk of accidents.

Question 5

Describe the method for conducting the light refraction experiment.

Answer 5

The method involves setting up the ray box, drawing a line labeled ‘N’ for normal, placing the transparent blocks on paper, marking incident and transmitted rays, measuring angles, recording measurements, plotting a graph, and calculating the refractive index for each block.