2. It is an optical effect observed in an optical device (lens, mirror, etc.) that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike nearer the center.

3. It can be defined as the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence (called as normal).

4. In optics, the maximum diameter of a light beam that can pass through an optical system.

5. This type of lens is thicker at the centre and thinner at the edges.

6. It is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope).

7. It is part of the retina at the back of the eye.

8. It is a common vision condition in which near objects appear clear, but objects farther away look blurry.

9. Lens of a microscope is the one at the bottom near the sample.

10. The clear jelly that fills the eyeball behind the lens. It helps support the shape of the eye and transmits light to the retina.