Questions
In which case is the image formed by a convex lens real and of the same size as the object? Show the ray diagram.
The powers of the two convex lenses are +2D and +4D respectively.
- Which of them is thicker? Give reason.
- Calculate the focal length of each lens.
Define the power of a lens.
Define the focus of a lens.
Define the principle axis of a lens.
Define the optical center of a lens.
Define center of curvature of a lens.
A person is curious to know why a rainbow always appears semicircular and of the same size. Write down the solution to his curiosity. Include in your answer the position of the sun in the rainbow, the position of the water droplets in the air, and the process of dispersion of light.
Draw a ray diagram showing the dispersion of light through a prism.
Draw a ray diagram showing the refraction of light through a glass slab.