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Does a concave lens have a real or a vir...

Does a concave lens have a real or a virtual focus?

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To determine whether a concave lens has a real or a virtual focus, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Lens Type**: - A concave lens is a diverging lens. This means that it causes parallel rays of light to spread out or diverge after passing through the lens. 2. **Drawing Parallel Rays**: ...
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a) With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principle axis, optical center, principal focus and focal length of the convex lens on the diagram. b) State whether convex lens has a real focus or a virtual focus. c) List some things that convex lens and concave mirror have in common.

Prove that when an object is placed in front of a concave lens, the image formed is (i) virtual (ii) erect (iii) diminished (iv) and located between pole and focus.

The image formed by a concave lens is always virtual.

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How would a pencil look like if you saw it through a) a concave lens, and b) a convex lens? (Assume the pencil is close to the lens). Is the image real or virtual?