Explanation

The retina is the innermost layer of the eye that senses light and sends visual signals to the brain, much like the film in a camera captures images.

Explanation

• The optical centre is the point within a lens where a ray of light passes through without changing its direction or path.
• This point is located at the centre of the lens, on the optical axis.

Explanation

A converging lens (also known as a convex lens) refracts parallel rays of light and converges them at a single point, called the focal point.

Explanation

• Air expands the most for a given rise in temperature, due to its low density and high thermal expansion coefficient.
• This is why hot air rises and cool air sinks, driving convection currents in the atmosphere.

Explanation

• In a mercury thermometer, the mercury in the bulb expands and rises in the tube, which has a linear scale ranging from 35°C to 42°C.
• This range is typically used for medical thermometers to measure human body temperature.

Explanation

• A rivet is used to fasten two hard materials together.
• Such as metal plates or sheets.

Explanation

• Water has its minimum density at 0°C.
• Water has its maximum density at 4°C.

Explanation

• Thermal Contraction is the decrease in size (length, area, and volume) of a body due to a decrease in temperature.
• Thermal Expansion is the opposite phenomenon, where the size increases due to an increase in temperature.

Explanation

• Thermal Expansion is the natural increase in size of a substance as its temperature increases.
• It's a common phenomenon in solids, liquids, and gases.

Explanation

• Measuring cylinders are designed to measure the volume of liquids.
• It allowing for precise measurements in scientific experiments and procedures.