7. A Candle is placed 4 cm in front of a convex lens. The image of the candle is focused on a sheet of paper that is exactly 10 cm behind the lens
What is the Magnification of the image

Magnification m is 2.5cm

Explanation:

This problem bothers on lenses

Given data

Object distance u= 4cm

Height of object v= 10 cm

The problem is quite straightforward seeing that object and image distances are given

We know that the magnification

m= size of image/size of object

m= v/u= 10/4 = 2. 5cm

What is a convex lens

A convex lens is a type of lens that has the centre thicker than the ends, the thickness at the centre makes the lens surface to curve outward. Convex lens causes close light rays of light to converge at a point after refraction.