LT

Question 1

What are the characteristics of images formed by plane mirrors

Answer 1

Virtual, upright, perpendicular object distance from plane mirror is the same as perpendicular image distance from plane mirror, laterally inverted, same size as object

Question 2

What are the laws of reflection

Answer 2

Incident ray, reflected ray, normal at the point of incidence all lie in the same plane
angle of incidence = angle of reflection

Question 3

What are the characteristics of images formed by concave mirrors

Answer 3

virtual, upright, magnified

Question 4

What are the characteristics of images formed by convex mirrors

Answer 4

virtual, upright, smaller

Question 5

What is refraction

Answer 5

It is the bending of light as it passes form one medium to another of different optical density

Question 6

What are the applications and harmful effects of infrared

Answer 6

in thermal imaging cameras to screen ppl for fever, in intruder alarms using passive infrared detectors, in remote controllers to control electronic devices

overexposure can damage our eyes, infrared radiation trapped in the atmosphere can cause global warming

Question 7

What are the applications and harmful effects of visible light

Answer 7

allows plants to photosynthesize, allows us to carry out our daily activities, in optical fibres for medical purposes and telecommunications

cause chemical changes in some materials, causing their quality to deteriorate, causes light pollution

Question 8

What are the applications and harmful effects of UV rays

Answer 8

disinfect medical equipment, foo, and water, allows our bodies to produce vitamin D

overexposure can harm our eyes and cause skin cancer