Light waves

Question 1

Rays of in the laboratory are produced with

Answer 1

Ray box

Question 2

Two natural effects that result from rectinclinear propagation of light is

Answer 2

Shadows and Eclipse

Question 3

Light waves consist of two parts____ the dark area and ____ the grey area

Answer 3

Umbra and penumbra

Question 4

The type of eclipse formed when the extreme rays at the moons edge intersect b4 reaching the earth is

Answer 4

Annular eclispe

Question 5

In a pinhole camera if the hole is small the image formed with be but if the hole is big the image formed will be

Answer 5

Sharp , Bright and blurry

Question 6

If the distance btw the screen and the hole is increased the image will be

Answer 6

Enlarged but less bright

Question 7

The decrease in brightness is gotten as a result

Answer 7

Distribution of light over the enlarged image

Question 8

One factor that allows light to enter sufficiently in pinhole camera is

Answer 8

Exposure

Question 9

The 2 typw of reflections are

Answer 9

Scattered and diffused

Question 10

Examples of items that give scattered and diffuse reflections and regular

Answer 10

Cloths and mirror

Question 11

The principle that confirms that light is reversible is the

Answer 11

Principle of reversibility

Question 12

Virtual image is one ___ while a real image is ____

Answer 12

That cannot be caught on screen,One that can be caught on screen and light passed through it

Question 13

Parallax

Answer 13

Is the relative movement of objects when their not is the same distance from the observer

Question 14

Features of a plane mirror include

Answer 14

Same size,Virtual,laterrally inverted,upright

Question 15

Kaleidoscope

Answer 15

Is based on the principle of inclined mirros which allows it to produce multiple images and different patterns

Question 16

Periscope is an instrument used for

Answer 16

Looking over planes and barriers

Question 17

The major disadvantage of a periscope is that

Answer 17

It produces too much images

Question 18

___ is used in the measurement of very small currents

Answer 18

Mirror galvanometer

Question 19

When a mirror is rotated theough an angle (0) the relfected ray is rotated

Answer 19

Through twice the angle

Question 20

If the inside is silvered and the outside part is reflecting its a ____ if the outside is silvered the inside is relfecting its a

Answer 20

Convex and concave

Question 21

Principal focus

Answer 21

Is the point which rays are said to converge after reflected

Question 22

The size and natte of image formed by curved mirror depnds on the

Answer 22

Position

Question 23

When and object is placed beyoond the centre of curvature its and on centre of C and then between Focus and Pole

Answer 23

Diminished,real inverted.|Same size and inverted| And Virtual And erect

Question 24

Concave mirros are used mainly as

Answer 24

Shaving mirros for their ability to enlarge

Question 25

Convex mirrors are used as driving mirros because

Answer 25

They give erect images and have wide field of view

Question 26

Convex mirros main disadvantage is their

Answer 26

Images are always small and false impression of distance

Question 27

Parabolic concave mirrors are used in preference to Spherical curved mirros because

Answer 27

Spherical C.M do not provide the same level of intensity