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When light passes through a lens, it is refracted at both faces of the lens - Leaving Cert Physics - Question 12 - 2015
Question 12
When light passes through a lens, it is refracted at both faces of the lens. Copy the diagram on the right into your answer book and complete the path of the light ... show full transcript
Worked Solution & Example Answer:When light passes through a lens, it is refracted at both faces of the lens - Leaving Cert Physics - Question 12 - 2015
Step 1
Copy the diagram and complete the path of the light ray.
Answer
- Start by copying the provided diagram accurately.
- Draw a line representing the incoming light ray approaching the lens.
- Draw the normal line at the point where the ray strikes the first surface of the lens.
- Mark the first refraction angle at the first surface of the lens.
- Complete the path of the light ray exiting the lens with the corresponding normal at the second surface.
- Represent the second refraction angle as the ray exits the lens.
Step 2
Draw a ray diagram to show the formation of a virtual image in a converging lens.
Answer
- Identify the object's position inside the focal point of the converging lens.
- Draw a ray from the object parallel to the principal axis which refracts through the focal point after passing through the lens.
- Draw a second ray from the object towards the center of the lens, which passes straight through.
- Extend the refracted rays backward to locate the virtual image, indicating that it appears on the same side as the object.
Step 3
Calculate the power of the combination.
Answer
- Calculate the individual powers of the lenses:
- The power of the converging lens ():
P_1 = rac{1}{f_1} = rac{1}{0.20} = +5 ext{ D} - The power of the diverging lens (): P_2 = rac{1}{f_2} = rac{1}{-0.08} = -12.5 ext{ D}
- The power of the converging lens ():
- Use the formula for combined power:
Step 4