Question

What are the various applications of lens?

Answer 1

• The objective lens of a telescope, camera, slide projector, etc. is a convex lens which forms real and inverted image of object.
• Our eye lens is also a convex lens. The eye lens forms the inverted image of the object on the retina.
• The eye defects are corrected by lenses.
• A magnifying glass is nothing but a convex lens of short focal length fitted in a steel (or plastic) flame provided with a handle.
• In spectroscope, convex lenses are used for obtaining a pure spectrum.
• A concave lens is used as eye lens in a Galilean telescope to obtain an erect final image of the object.