Q1.
What changes can be seen in the objects when viewed through lenses?
Answer
The object can change in size and, with a convex lens, even in orientation.
| Lens | Object close to the lens | Object taken far from the lens |
|---|---|---|
| Convex | Erect and enlarged | Inverted — first enlarged, then getting smaller |
| Concave | Erect and diminished | Still erect, becoming smaller |
Why a convex lens can flip the object but a concave lens cannot: a convex lens converges the light passing through it, so beyond a certain object distance the rays actually cross before reaching your eye — and crossed rays give an inverted view. A concave lens only ever spreads the rays out; they never cross, so what you see can never be upside down.