Geometrical Optics Flashcards
What is a lens ?
A piece of Transparent material that can focus a transmitted beam of light
What are two types of lenses ?
🥱convex / converging lens
🥱 diverging/ concave lens
The point f to which the rays are brought to focus is called?
Principal focus or focal point
Distance between optical centre and its principle focus is called
Focal length
Convex lens gives
Real image
Concave gives
Virtual images
Real Images are always ?
Inverted
Virtual images are always ?
Errect
What is Visual angle ?
The apparent size of the object depends upon angle substanted by the eye
Least distance of distinct vision is?
25cm
A type of convex lens which brings object closer is called ?
Magnifying 🔍 glass
An optical instrument which is used to see small object with very high magnification is called ?
Compound microscope 🔬
Image formed by compound microscope is ?
Virtual and very much magnified
Optical instrument used to see distant object and heavenly bodies that is planets and stars is called ?
Astronomical telescope
Image formed by astronomical telescope is ?
Highly magnified / inverted / virtual