The image of a candle flame placed at a distance of 36 cm from a spherical lens formed on a screen placed at a distance of 72 cm from the lens. Identify the type of lens and calculate its focal length. If the height of the flame is 2.5 cm, find the height of the image.
Given: Object distance, u=-36
Image distance, v= +72
The image is Real and is depicted with the help of positive sign.
height of the object, h1 = 2.5 cm
Applying the lens formula, we get
Since the focal length is positive, so the lens will be a convex lens of focal length 24 cm.
Now, Magnification is given by the relation: 
Also magnification is given by: 
The negative sign depicts that the image is inverted.
The nature of the image formed will be:
1. Real
2. Inverted
3. Magnified
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