Question

An object is placed at a distance of 10 cm on the principal axis of a convex
lens whose focal length is less than 10 cm, then the image of it observed
at a distance of 30 cm from the lens. Find the nature and magnification of
image.
A)​

Answer 1

Answer:

Magnification of lens=v/u=30/10=3

Nature, To find nature of image formed by mirror,lens

• check type of lens/mirror ,find focal length, check position of object wrt focal length , remember nature and position of image for object placed at various respective positions and relate it.
• For q, object: beyond focus - image= btw OC and focus ,size enlarged,real
• Nature consists of Size, Inverted/erect,Real/virtual. Always remember meaning of various terms in optics