chapter 12 - light

Question 1

second law of reflection

Answer 1

angle of incidence i is equal to agle of reflection r

Question 2

what is refraction ?

Answer 2

bending of light as it passes from one optical medium to another

Question 3

what is 2nd law of refraction

Answer 3

the ratio of the sine of angle of incidence (i) to the sine of angle of refraction (r) is a constant

Question 4

critical angle formula

Answer 4

sin c = 1/n

Question 5

if light ray comes in parallel to converging lens principal axis

Answer 5

it is refracted to pass through the focal point

Question 6

uses for converging lenses ?

Answer 6

magnifying glasses, cameras, specticles

Question 7

properties and uses of object before 2F

Answer 7

diminished, inverted and real

uses: camera

Question 8

properties and uses of object on 2F

Answer 8

same size, inverted, real

uses: photocopier

Question 9

properties and uses of object before F

Answer 9

magnified, inverted, real

uses: projector

Question 10

properties and uses of object on F

Answer 10

magnified, upright, virtual

uses: spotlight

Question 11

properties and uses of object before F

Answer 11

magnified, upright, virtual

uses: magnifiying glass