A 5 cm tall light bulb is placed at a distance of 30 cm from a concave mirror having a focal length 0f 20 cm. What is the image distance? *

10 cm 40 cm 50 cm 60 cm

Which mirror is shown in the figure? *

Captionless Image convex mirror concave mirror plane mirror silver mirror

How do the wavelength, frequency and speed of ultraviolet rays in vacuum compare with those visible light? *

longer wavelength, higher frequency, slower speed longer wavelength, lower frequency, same speed same wavelength, lower frequency, slower speed shorter wavelength, higher frequency, same speed

Who among these physicists developed the principle of electromagnetic induction? *

Hans Christian Oersted Michael Faraday Heinrich Hertz James Clerk Maxwell

It is a box-like device used for taking pictures. It uses a lens that produces a real image on photographic film. Which of the following is being described? *

Camera Microscope Telescope Periscope

Which of the following images can be formed by a concave mirror? I. real, inverted, and enlarged II. virtual, upright, and enlarged III. real, upright, and reduced IV. virtual, inverted, and enlarged *

I and II I and III I, III, and IV II and IV

What EM radiation is also used in sterilizing water from drinking fountains? *

infrared waves microwaves radio waves ultraviolet

Sandra went to the beach with his friends one day and spent several hours playing in the water and enjoying the sunny weather. When he got back home, however, he noticed that her skin had turned a bright shade of pink, and it felt a little bit hot. After a few hours, it was even redder and started to hurt. After a day at the beach, Sandra had come home with a bad sunburn. What caused Sandra's skin to turn red and hot? *

It happened because electromagnetic radiation from the water caused damage to the cells in his skin. It happened because electromagnetic radiation from the sun caused damage to the cells in his skin. It happened because electromagnetic radiation from the surroundings caused damage to the cells in his skin. It happened because electromagnetic radiation from the temperature difference caused damage to the cells in his skin.

Which of the following important points in lens that corresponds to its geometric center? *

Focal point vertex center of curvature principal axis

Where should an object be placed in front of a concave mirror so that the image will have the same size as the object? *

At the focus At the center of curvature Between focus and the vertex Between focus and the center of curvature

Light changes speed as it travels through various mediums. What are examples of mediums that light can travel through. *

snow and ice air and water cloth and wood glass and wood

A diverging lens is also known as a ____ lens. *

convex concave double refracted

The concave lenses are used to rectify the problem of nearsightedness (myopia). *

True False

He discovered that the current carrying wire caused nearby magnetized compass needle to deflect. *

Hans Christian Oersted Michael Faraday James Maxwell Heinrich Hertz

Which forms upright and reduced images? *

Convex lens Concave lens Plane Mirror Concave Mirror

When an object is placed on the focal point in front of a convex lens, the image produced is ___. *

real, reduced, and inverted real, enlarged, and inverted real, true, and inverted There is no image

A 5 cm tall light bulb is placed at a distance of 30 cm from a concave mirror having a focal length 0f 20 cm. Where did the image formed in this problem? *

At point F At point C Between point F and C Beyond or further than point C

A student placed a pencil in a cup of water. The pencil appears broken because light- *

Captionless Image always travels in a straight line bends when it passes through water makes the water in the glass evaporate reflects the pencil on the water's surface

What type of lens do humans have in their eyes? *

Concave Lens Convex Lens

Generators are devices that convert _____ energy into _____ energy. *

electrical; mechanical mechanical; electrical chemical; potential mechanical; kinetic

Which description is true about the radio waves in the electromagnetic spectrum? *

It has the shortest wavelength and highest frequency. It has the longest wavelength and lowest frequency. It has the longest wavelength and higher frequency. It has the wavelength and lower frequency.

What type of mirror do dentists usually use to clearly see the images of our teeth? *

Plane Mirror Concave Mirror Convex Mirror Concave lens

Which optical device consisting with a tube attached to mirrors or prisms, through which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight? *

Microscope Periscope Telescope Binoculars

If you stand 3 m in front of a plane mirror, how far away would you see yourself in the mirror? *

1.5 m 3 m 6 m 12 m

What can electromagnetic waves travel through that mechanical waves cannot travel through? *

air vacuum water wood

What causes light to appear refracted? *

temperature of the materials change in speed amount of materials

A converging lens is also known as a ____ lens. *

convex concave double refracted

If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror *

is equal to the height of the man. is equal to one half the height of the man. is equal to double the height of the man. depends on the distance the man stands from the mirror.

What kind of principal ray is shown when the incident ray passes through the focus while the refracted ray is parallel to the principal axis? *

P-F ray F-P ray V ray C-C ray

What kind of principal ray is the ray parallel to the principal axis and the refracted that pass through the focus behind the lens? *

P-F ray C-C ray F-P ray V ray

Microwave is ___________ in energy, ___________ in frequency than Infrared. *

higher, lower higher, higher lower, lower lower, higher

Which optical instrument uses 2 convex lenses to make a smaller object larger? *

Camera Microscope Telescope Periscope

What is the image distance if a 3.00 cm tall light bulb is placed a distance of 20 cm from a diverging lens having a focal length of -10 cm? *

7 cm 10 cm 15 cm 20 cm

Among the following EM waves, which one can be classified as both ionizing and non-ionizing radiation? *

x-ray visible light ultraviolet rays infrared

Which of the following images can be formed by a convex mirror? I. real, inverted, and enlarged II. virtual, upright, and reduced III. real, upright, and reduced IV. virtual, upright, and enlarged *

I and II I only II only IV only

A convex mirror has a focal length 12 cm. Then its radius of curvature is *

6 cm 12 cm 18 cm 24 cm

Which of the following EM waves is much dangerous that can cause significant cell damage? *

Ultraviolet rays Gamma rays X-rays Infrared

A light ray, traveling parallel to a concave mirror's axis, strikes the mirror's surface. The reflected ray ____________. *

Passes through the mirror's focal point Again, travel parallel to a concave mirror's axis Travels at right angles to the mirror's axis Passes through the mirror's center of curvature

The point where the rays meet is known as.... *

Fire the focal point refraction Plane of the lens

Which of the following statement/s is/are true? I. All electromagnetic waves can travel in an empty space. II. Only those electromagnetic waves that have high energy can travel as fast as the speed of light. III. Electromagnetic waves vary in wavelength, frequency, and energy. IV. Frequency refers to the horizontal distance of a wave. *

I only I and II I and III IV only

What kind of mirror is used by Department stores to give a wider area and smaller image of the shopper/buyers? *

Plane mirror Concave Mirror Convex mirror None of these

.Which of the following health effects is classified as electrical sensitivity? *

Cancer Headaches Concentration or memory loss Cognitive Impairment

The electromagnetic spectrum shows the complete range of frequencies of electromagnetic waves from the lowest to the highest, including, in order, radio, infrared, visible light, ultraviolet, X-ray, and gamma ray waves. Which of the following statements explains how electromagnetic waves are produced? *

Electromagnetic waves are produced when energy moves a substance, a material, or a "thing" within a medium that will conduct the mechanical energy of motion away from the source. Electromagnetic waves are longitudinal waves that are produced when the motion of the individual particles of the medium is in a direction that is parallel to the direction of energy transport. Electromagnetic waves are transverse waves that can be created by accelerating charges, moving charges back and forth that produce oscillating electric and magnetic fields, and this travel at the speed of light. Electromagnetic waves are produced whenever two waves of identical frequency interfere with one another while traveling opposite directions along the same medium

Which of the following characteristic of an image formed for a convex mirror? *

Enlarged size virtual image Real image inverted image

Gamma rays are emitted by stars and some radioactive substances. Which of the can only block these waves ? *

lead and thick concrete ceramics and plastics woods and blocks water and oil

What type of lens produces enlarged, virtual, and upright images? *

Concave lens Converging lens Diverging lens cannot be determined

Which of the following is NOT a property of the image formed by a plane mirror? *

virtual and erect Object size = image size object distance = image distance Real and inverted

The relation between focal length and radius of curvature is *

1/R = 2f 1/f = 2R f = R/2 R = 2/f

Which of the following optical instrument has a converging lens and bunches of optical fibers that convey the image to the end of the tube, where the image can be observed through a computer monitor or screen? *

endoscope camera telescope periscope