Raman uses a lens to focus sunlight onto a piece of paper and it starts to burn. What type of lens is he using?

"A lens can form a magnified erect image as well as magnified inverted image of an object placed in front of it". State the nature of this lens and draw ray diagrams to justify the above statement. Mark the positions of O,F and 2F in the diagram

TextMyopia or Near-sightednessCorrection of Vision Defects Using LensesSpherical Lenses: Convex and Concave

With the help of labelled ray diagram show

CASE_STUDIESMyopia or Near-sightednessCorrection of Vision Defects Using LensesSpherical Lenses: Convex and Concave

Many optical instruments consist of a number of lenses. They are combined to increase the magnification and sharpness of the image. The net power (P) of the lenses placed in contact is given by the algebraic sum of the powers of the individual lenses P1,P2,P3… as P= P1 + P2 + P3… This is also termed as the simple additive property of the power of lens, widely used to design lens systems of cameras, microscopes and telescopes. These lens systems can have a combination of convex lenses and also concave lenses.

CASE_STUDIESSpherical Lenses: Convex and ConcavePower of a Lens