Q. 24.0( 6 Votes )

# Write down the magnification formula for a lens in terms of object distance and image distance. How does this magnification formula for a lens differ from the corresponding formula for a mirror?

Answer :

Magnification (m) formula for a lens in terms of object distance (u) and image distance (v) is:

Magnification formula for a mirror in terms of object distance (u) and image distance (v) is:

Magnification formula for a mirror has a minus sign (-) but the magnification formula for a lens has no minus sign.

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For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.

Xam idea - ScienceRedraw the ray diagram given below in your answer book and completer the path of ray.

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Only one of the following applies to a concave lens. This is:

Lakhmir Singh & Manjit Kaur - PhysicsState whether convex lens has a real focus or a virtual focus.

Lakhmir Singh & Manjit Kaur - PhysicsExplain what is meant by a virtual, magnified image.

Lakhmir Singh & Manjit Kaur - PhysicsWhen we focus sunlight using a convex lens at the tip of a matchstick, what will happen? Why?

All In One ScienceCopy and complete the diagram below to show what happens to the rays of light when they pass through the concave lens:

Lakhmir Singh & Manjit Kaur - Physics