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Questions and Answers
What happens to the focal length of a lens when it is placed in a medium of higher refractive index?
What happens to the focal length of a lens when it is placed in a medium of higher refractive index?
- It remains the same
- It increases
- It decreases (correct)
- It becomes zero
Which of the following phenomena is responsible for the formation of a rainbow?
Which of the following phenomena is responsible for the formation of a rainbow?
- Dispersion (correct)
- Refraction
- Reflection
- Diffraction
What happens to the image distance when an object is placed between the focus and the optical center of a convex lens?
What happens to the image distance when an object is placed between the focus and the optical center of a convex lens?
- It becomes positive
- It remains the same
- It becomes negative (correct)
- It becomes zero
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Study Notes
Lens and Refractive Index
- When a lens is placed in a medium of higher refractive index, its focal length decreases.
Rainbow Formation
- The phenomenon responsible for the formation of a rainbow is refraction, combined with dispersion and internal reflection.
Convex Lens Image Distance
- When an object is placed between the focus and the optical center of a convex lens, the image distance is greater than the object distance.
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