Optics and Electromagnetic Devices Quiz

The distance from the lens to the point where light rays converge to form an image.

The total magnification of a compound microscope is the product of the objective lens magnification and the eyepiece magnification.

Reflects light using mirrors to view objects above your line of sight.

Increased via lens power/focal length adjustments.

Moving the back wall further from the pinhole makes the image smaller and fainter.

Converts mechanical energy into electrical energy.

Produces alternating current (AC).

A generator converts mechanical energy to electrical energy, while a motor converts electrical energy to mechanical energy.

Infrared radiation (IR) is used in the treatment of muscle ache due to its ability to penetrate tissues and generate heat, promoting relaxation and pain relief.

Microwaves heat food by vibrating water molecules. Their frequency must match the resonant frequency of water molecules for maximum energy transfer.

X-rays are used to study solid structures because they have high energy and can penetrate materials, revealing internal details.

Cellular phones utilize ultra-high frequency radio waves for wireless communication.

Visible light and radio waves are the dominant electromagnetic waves that pass through the atmosphere and reach Earth's surface.

Gamma rays and X-rays, due to their high energy, are both the most harmful and useful EM waves. Gamma rays can cause radiation damage, but are also used in cancer treatment. X-rays can cause DNA damage, but are essential for medical imaging.

The image formed by a plane mirror is located at the same distance behind the mirror as the object is in front of it.

Gamma rays are more dangerous than visible light because they have higher energy and can penetrate matter more easily, causing damage to cells and DNA.

The Greenhouse effect refers to the trapping of heat within Earth's atmosphere by certain gases, which allows solar radiation in but prevents some heat radiation from escaping. This is represented in the diagram by the circled area labeled Z.

X-rays can be dangerous due to their ability to cause cancer, but they are also useful in diagnosing diseases by imaging internal body parts.

When an object is placed at 1.5 focal lengths from a convex mirror, the image formed is erect (upright) and virtual (cannot be projected on a screen).

An object placed 30 cm from a convex mirror with a focal length of 10 cm will have its image located 7.5 cm behind the mirror.

An object placed at the focus of a concave mirror forms a real, inverted, and highly enlarged image at infinity.