Refraction of light

Question 1

Measure that shows how a medium influences the speed of light passing through it

Answer 1

Optical desnity

Question 2

What is refraction?

Answer 2

When a ray of light entering obliquely from one transparent medium to another, its path undergoes a deviation at the surface of sepration.

obliquely; having a slanting direction or position

Difference in optical density causes the deviation

Question 3

While entering from a medium of lower optical density to that of a greater one the refracted ray deviates towards the ____

Answer 3

Normal

Question 4

While entering from a medium of ____ optical density to that of a ____ one the refracted ray deviates away from the normal.

Answer 4

greater
lower

respectively

Question 5

Snell’s law

Answer 5

The ratio of the sine of the angle of incidence to the sine of the angle of refraction will always be a constant

Question 6

What is the constant from Snell’s law known as?

Answer 6

Refractive index

This is indicated by the letter ‘n’

Question 7

The refractive index of one medium with respect to another is

Answer 7

Relative refractiv index

Question 8

What is absolute refractive index

Answer 8

The refractive index of a medium with respect to vaccum

Question 9

What is critical angle

Answer 9

When a ray of light passes from a medium of greater optical density to that of lower optical density the angle of incidendce at which the angle of refraction becomes 90 degree is called critical angle

Question 10

What is the critical angle of water

Answer 10

48.6 degree

Question 11

What is total internal reflaction

Answer 11

When a ray of light passes from a medium of higher optical density to a medium of lower optical density at an angle greater than the critical angle, the ray is reflected back to the same medium without undergoing refraction.

Question 12

Define Optical center

of a lens

Answer 12

The midpoint of the lens

Question 13

Define center of cervature

of a lens

Answer 13

The center of imaginary spheres of which the sides of the lense are part of

Question 14

Define principal axis

of a lens

Answer 14

The imaginary line that passes through the optical center joining the two centers of curvature

Question 15

Define focal length

of a lens

Answer 15

Distance to the principal focus to the optical center

denoted by the letter ‘f’

Question 16

Define magnification

Answer 16

The rotio of the height image to the height of the object

shows how many times the image is as large as the object

Question 17

Formula of magnification(m)

Answer 17

hi
___

ho

hi - height of the image
ho - height of the object

Question 18

What is power of a lens

Answer 18

The reciprocal of the focal length expressed in meters

Question 19

Unit of power of lense

Answer 19

Diopeter(D)

Question 20

Which phenomenon of light is made use in the optical fiber that are used for communication

Answer 20

Total internal reflection