Question

verification to study the features of convex and concave lens​

Answer 1

Answer:

By touching:If the lens is thick in the middle and thin at the edges,the lens is convex and if the lens is thin at the middle and thick at the edges the lens is concave.

By seeing the image:

1) On keeping the lens near a printed page if the letters appear magnifies the lens is convex and if the letters appear diminished the lens is concave.

2)On seeing a distant object through a lens,if the inverted image is seen,the lens is convex but if an upright image is seen the lens is concave.