Explanation

• When light is focused in front of the retina, it creates a blurred image, indicating nearsightedness (myopia).
• This occurs because the eyeball is too long or the cornea is too steep.
• It causing light to focus before reaching the retina.

Explanation

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

Explanation

The correct equation for the position of the bright fringes in Young's double-slit experiment is:

𝑦 =𝑚𝜆𝐷/𝑑

Where

y is the position of the bright fringe on the screen.

m is the order of the bright fringe (0, 1, 2, ...).

λ is the wavelength of light.

D is the distance between the slits and the screen.

d is the distance between the two slits.

Explanation

• A constellation is a group of stars that, when viewed from Earth, form a pattern or shape that is recognizable.
• It has been given a specific name, such as Orion, Cassiopeia, or Ursa Major.

Explanation

• The hottest stars are the blue stars, and their temperature is around 25,000°C.
• These stars emit blue light due to their extremely high surface temperatures, which can range from 20,000 to over 30,000 degrees Celsius.

Explanation

• The color of an opaque or non-luminous object is the color of light it reflects.
• When light hits the object, some wavelengths are absorbed, and the remaining wavelengths are reflected, which is what we perceive as the object's color.

Explanation

• The triangular prism is one of the most commonly used dispersive prisms, particularly in spectroscopy and optical instruments.
• It is called a dispersive prism because it separates light into its different colors (spectrum) due to the different refractive indices of the glass for different wavelengths.

Explanation

• A Concave Mirror has a curved reflecting surface that bulges inward, like the front side of a spoon.
• This type of mirror is used in telescopes, solar concentrators, and other applications where light needs to be focused.

Explanation

A compound machine is a machine that is made up of two or more simple machines.

A bicycle, a crane, wheel borrow and scissors are examples of compound machines because they are made up of multiple simple machines, such as:

• Wheels and axles (simple machine: wheel)
• Pedals and levers (simple machine: lever)
• Gears and pulleys (simple machine: pulley)
• Inclined planes (simple machine: inclined plane)

Explanation

• A lever is a stiff bar that rests on a support called a fulcrum, which lifts or moves loads.
• The fulcrum is the point where the lever pivots, and it can be used to change the direction of a force or to gain a mechanical advantage, making it easier to lift or move heavy loads.
• Examples: Hammer, crow bar, a pair of pilers and seesaw.