Thin Lens

Question 1

Types of Lens

Answer 1

Concave and Convex

Question 2

Laws of Thin Lens

Answer 2

• An incident ray traveling through the optical center of the lens will continue to travel in the same direction after refracting through the lens
• Incident rays which travel paralllel to the principal axis will refract through the lens and converge at the focal point

Question 3

Parts of Thin Lens

Answer 3

• Focal Length
• Focal Point/ Principal Focus
• Principal Axis
• Optical Center

Question 4

Optical fibres used in medicine

Answer 4

• Endoscope
• Illuminating inside of body

Question 5

Virtual Image

Answer 5

• Rays don’t converge
• Inside the focal point
• Enlarged and Upright

Question 6

Real Image

Answer 6

• Rays Converge
• Outside the focal point
• Enlarged and Inverted

Question 7

Convex lens used to produce an image

Answer 7

• Magnifying Glass
• Eyepiece of Telescope
• Microscope
• Binoculars